TW202024305A - Blue-emitting phosphor compounds - Google Patents

Abstract

The present invention relates to blue-emitting compounds, to a process for the preparation thereof, and to the use thereof as phosphors or conversion phosphors in light sources. The present invention furthermore relates to a radiation-converting mixture comprising the compound according to the invention, and to a light source which contains the compounds according to the invention or the radiation-converting mixture. The present invention furthermore relates to light sources, in particular LEDs, and lighting units which contain a primary light source and the compound according to the invention or the radiation-converting mixture. The compounds according to the invention are suitable as luminescent materials, in particular for the generation of blue or white light in LEDs.

Description

Phosphor compound emitting blue light

The present invention relates to a compound that emits blue light, its preparation method and its specific use in phosphor-converted light-emitting devices, such as pc-LED (phosphor-converted light-emitting diode), which is used for Phosphors or conversion phosphors that convert radiation having a relatively short wavelength into radiation having a relatively long wavelength.

In addition, the present invention relates to a radiation conversion mixture containing the compound according to the present invention, and a light source containing the compound or mixture according to the present invention. The present invention further relates to a lighting unit containing a light source containing the compound or mixture according to the present invention. The compounds and mixtures according to the present invention are suitable as luminescent materials, in particular for generating blue or white light in solid-state LED light sources that contain LED chips that emit in the violet and/or near ultraviolet (UV) spectral range.

For more than 100 years, inorganic phosphors have been developed to adapt to the spectrum of light-emitting display screens, X-ray amplifiers, and radiation or light sources, so that they can meet the needs of various applications in the best possible way while consuming as little as possible energy. The type of excitation (that is, the nature of the main radiation source) and the necessary emission spectrum are important here for the selection of the host lattice and activator.

Especially for fluorescent light sources for general lighting (ie, low-pressure discharge lamps and light-emitting diodes), novel phosphors are constantly being developed to further improve energy efficiency, color reproduction and (color point) stability. Phosphors activated by Eu ²⁺ are used in discharge lamps (Hg and Xe discharge lamps) and plasma display panels, usually as blue-emitting components. In particular, the use of BaMgAl ₁₀ O ₁₇ :Eu (BAM:Eu) and (Ba,Sr,Ca) ₅ (PO ₄ ) ₃ Cl:Eu (SCAP) has only been used in fluorescent lamps (TL, CFL, QL). , PL) use SCAP.

Under UV irradiation, that is, at a wavelength of less than 400 nm, all phosphors activated by Eu ²⁺ show that their light yield decreases with the change of operation time, and its photoionization from Eu ²⁺ to Eu ³⁺ ( Photooxidation) caused (T. Jüstel, H. Nikol, Adv. Mater. 12, 2000, 527). It can be observed here that, for example, in the case of BAM:Eu, the light yield is only reduced when UV (VUV) excitation in vacuum (100-199 nm) is used, and when longer-wave UV radiation (200-399 nm) is used No decrease in brightness was observed during excitation. In other words, this finding means that photoionization requires sufficiently high excitation energy. Although the phosphor BAM:Eu emitted at 453 nm will be a stable blue light emitter for high-performance LEDs or laser diodes, it can only be excited in the UV range up to about 380 nm.

At the same time, LEDs almost completely replace other light sources in general lighting and backlighting areas, and laser diodes find more and more applications due to their increasing efficiency. (In,Ga)N semiconductor LED chips emitting between 380 nm and 420 nm are particularly efficient in this article (Figure 1) (see C.A. Hurni et al., Appl. Phys. Lett. 106, 2015, 031101).

Therefore, white LEDs based on UV-emitting semiconductors with a mixture of RGB phosphors are a definite alternative to universal white LEDs based on blue-emitting semiconductors with yellow or yellow/red converters. However, there is a need to obtain a blue phosphor that can be effectively excited in the range of 380 to 420 nm, that is, with a small Stokes shift. Although a sufficient amount of literature on blue-emitting phosphors has been published so far, the search continues to be an ideal phosphor as a converter for LEDs emitting at 380-420 nm.

Examples that can be mentioned here are aluminates, such as SrAl ₁₂ O ₁₉ :Eu ²⁺ , SrAl ₄ O ₇ :Eu ²⁺ and Sr ₄ Al ₁₄ O ₂₅ :Eu ²⁺ (D. Dutczak, T. Jüstel, C. Ronda, A. Meijerink, Phys. Chem. Chem. Phys. 2015, 17, 15236), phosphates, such as Ba ₃ (ZnB ₅ O ₁₀ )PO ₄ :Eu ²⁺ (J. Sun, X. Zhang, T. Li, Mater. Lett. 2018, 212, 343), Ca ₁₀ M(PO ₄ ) ₇ : Eu ²⁺ (M = Li, Na, K) (M. Chen et al., Chem. Mater. 2017, 29 , 7563), Ca ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ (X. Zhang, M. Gong, Mater. Chem. Phys. 2010, 124, 1243), and Sr ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ (SJ Dhoble, J. Phys. D 2000, 33, 158). With the help of combinatorial chemistry research, other phosphors have been produced, including materials KSrPO ₄ : Eu and Gd ₃ Al _3+x Si _3-x O _12+x N _2-x : Eu (Z. Xia et al., Dalton Trans. 45, 2016, 11214).

Despite all efforts, it has an emission maximum in the blue spectral range between 440 and 460 nm, exhibits high photoluminescence quantum yield, and is effective in the ultraviolet and violet spectral range from about 250 to about 430 nm The "perfect" blue-emitting phosphors for LEDs that are ground-excited, have high thermal quenching temperatures and in addition have high photochemical stability are still not available. Therefore, the search for phosphors that emit blue light continues.

The object of the present invention Therefore, the object of the present invention is to provide phosphors for LEDs, which emit in the blue spectral range with an emission maximum of about 450 nm, have high photoluminescence quantum yield and can Excite effectively in the ultraviolet and violet spectrum of about 250 to about 430 nm. In addition, the object of the present invention is to provide a phosphor for LED which has a high thermal quenching temperature and additionally has high photochemical stability. This allows those who are familiar with the technology to better choose suitable materials for producing blue or white LEDs.

In addition, the object of the present invention is to provide a method for preparing phosphors having the above-mentioned characteristics. In addition, the object of the present invention is to provide a radiation conversion mixture containing a phosphor, and a light source and lighting unit containing the radiation conversion mixture or the phosphor.

Unexpectedly, it has been found that the above-described object is achieved by the compound of general formula (I): [M ^I ₄ M ^II ₇ (AO ₄ ) ₆ ] _n (I), which is characterized by doping with compound of general formula (I) With RE and Li or doped with RE, each of the following applies to the symbol and index used: M ^I is selected from the group consisting of Na, K, Rb, Cs and a mixture of two or more; M ^II Selected from the group consisting of Mg, Ca, Sr, Ba, Cu, Zn and a mixture of two or more; A is selected from P, As, Sb, Bi, V, Nb, Ta and two or both of them The group consisting of a mixture of more than one; RE is selected from the group consisting of Eu, Yb, Sm, Mn and a mixture of two or more thereof; 0 <n ≤ 4.

The inventors of the present invention have unexpectedly discovered that the compound of general formula (I) and RE and Li or RE doping produces emission in the blue spectral range with an emission maximum of about 450 nm, with high photoluminescence quantum yield and A luminescent material that can be effectively excited in the ultraviolet and violet spectrum of about 250 to about 430 nm.

The compound according to the present invention exhibits effective photoluminescence in the blue spectral range and has an emission band with an emission maximum of about 450 nm, preferably between 440 and 460 nm, more preferably between 445 and 455 nm. In a preferred embodiment, the compound of formula (I) has a single emission band with an emission maximum of about 450 nm, more preferably between 440 and 460 nm, and most preferably between 445 and 455 nm.

Due to the small Stokes shift, these blue-emitting phosphors can be excited in the UV range and the violet spectral range. Therefore, the compound is suitable as a blue-emitting converter in an LED emitting in the near ultraviolet.

The compounds according to the present invention can generally be excited in the spectral range of about 250 to about 430 nm, preferably about 250 to about 405 nm, when the absorption maximum is between 250 and 325 nm, usually about 400 to about 550 nm The emission maximum is in the blue spectral range of about 450 nm, preferably in the range between 440 and 460 nm, and more preferably in the range between 445 and 455 nm. In addition, the compound according to the present invention exhibits high photoluminescence quantum yield and high spectral purity, and has a high thermal quenching temperature and high photochemical stability. Therefore, it is suitable for manufacturing blue-emitting or white-emitting LEDs.

In the context of this application, ultraviolet light means light with a maximum emission between 100 and 399 nm, purple light means light with a maximum emission between 400 and 430 nm, and blue light means light with a maximum emission between Light between 431 and 480 nm, cyan light represents light with a maximum emission between 481 and 510 nm, green light represents light with a maximum emission between 511 and 565 nm, and yellow light represents light with a maximum emission between 511 and 565 nm. For light between 566 and 575 nm, orange light represents light with an emission maximum between 576 and 600 nm, and red light represents light with an emission maximum between 601 nm and 750 nm.

In a preferred embodiment, the compound of general formula (I) is represented by the following general formula (II): [M ^Ia ₃ M ^Ib M ^II ₇ (AO ₄ ) ₆ ] _n (II), where: M ^Ia is selected from The group consisting of Na, K, Rb, and Cs; M ^Ib is selected from the group consisting of Na, K, Rb, Cs and a mixture of two or more thereof; and the definition indicated for general formula (I) applies to Other symbols and indices used.

M ^Ia and M ^{Ib are} preferably different from each other.

In a more preferred embodiment, the compound of general formula (I) is represented by the following general formulas (Ia) and (Ib): [M ^I _4-x M ^II _7-x (AO ₄ ) ₆ : RE _x , Li _x ] _n (Ia) [M ^I _4-2x M ^II ₇ (AO ₄ ) ₆ :RE _x ] _n (Ib), where: 0 <x ≤ 1; and the definition indicated for general formula (I) applies to all Other symbols and indices used.

In a more preferred embodiment, the compound of general formula (II) is represented by the following general formulas (IIa) and (IIb): [M ^Ia _3-y M ^Ib _1-z M ^II _7-x (AO ₄ ) ₆ : RE _x ,Li _x ] _n (IIa) [M ^Ia _3-2y M ^Ib _1-2z M ^II ₇ (AO ₄ ) ₆ :RE _x ] _n (IIb), where: 0 ≤ y ≤ 1; 0 ≤ z ≤ 1 ; Y + z = x; and 0 <x ≤ 1.

The following is preferably applicable to the exponent n in the general formulas (I), (Ia), (Ib), (II), (IIa) and (IIb): 0 <n ≤ 3, more preferably 0 ＜ n ≤ 2 .

In a particularly preferred embodiment, the index n in formulas (I), (Ia), (Ib), (II), (IIa) and (IIb) is an integer selected from 1, 2 and 3.

In a particularly preferred embodiment, the following applies to the exponent n in the general formulas (I), (Ia), (Ib), (II), (IIa) and (IIb): n=1.

In the compound according to the present invention, M ^I is a single charged cation (M ^I ) ⁺ and M ^II is a double charged cation (M ^II ) ²⁺ . A form of the oxidation state + ^V A in the form of V, RE RE ²⁺ was double charged cations form, Li form singly charged cations Li ⁺ form and the oxygen O in an oxide (O ^2-) form. The compound according to the present invention is a conversion material doped with RE and Li or doped with RE, where charge equalization occurs through the replacement of one M ^I and one M ^II with one RE and one Li in the case of doping with RE and Li and doped with a charge balancing via the RE RE case two permutation M ^I occurs.

The following are preferably applicable to the compounds of the general formulae (I), (Ia) and (Ib) of the present invention: M ^I is selected from the group consisting of Na, K, Rb and Cs, and mixtures of two or more thereof; M ^II is Mg, which can be partially replaced by Ca, Sr and/or Ba; A is P, which can be partially replaced by As, Sb, V, Nb, and/or Ta; and RE is selected from Eu, Yb, Sm, A group consisting of Mn and two or a mixture of two or more.

The following are preferably applicable to the compounds of the general formulae (II), (IIa) and (IIb) of the present invention: M ^Ia is selected from the group consisting of Na, K, Rb and Cs; M ^Ib is selected from the group consisting of Na, K, Rb And Cs and a group consisting of two or more of them; M ^II is Mg, which may be partially replaced by Ca, Sr and/or Ba; A is P, which may be partially composed of As, Sb, V, Nb and/ Or Ta substitution; and RE is selected from the group consisting of Eu, Yb, Sm, Mn, and a mixture of two or more thereof.

Particularly preferred compounds of general formula (IIa) are: Na _3-y (K _1-ab Rb _a Cs _b ) _1-z Mg _7-x (P _1-c As _c O ₄ ) ₆ :Eu _x ,Li _x ( IIIa), K _3-y (Na _1-ab Rb _a Cs _b ) _1-z Mg _7-x (P _1-c As _c O ₄ ) ₆ : Eu _x ,Li _x (IVa), Rb _3-y ( Na _1-ab K _a Cs _b ) _1-z Mg _7-x (P _1-c As _c O ₄ ) ₆ :Eu _x ,Li _x (Va), Cs _3-y (Na _1-ab K _a Rb _b ) _1-z Mg _7-x (P _1-c As _c O ₄ ) ₆ : Eu _x ,Li _x (VIa), where: 0 ≤ a ≤ 1, preferably 0.0 ≤ a ≤ 0.5; 0 ≤ b ≤ 1 , Preferably 0.0 ≤ b ≤ 0.5; 0 ≤ a + b ≤ 1; 0 ≤ c ≤ 1, preferably 0.0 ≤ c ≤ 0.5; 0 ≤ y ≤ 1; 0 ≤ z ≤ 1; y + z = x; and 0 <x ≤ 1.

In the general formulae (IIIa), (IVa), (Va) and (VIa), preferably c=0 or c=1.

In general formulas (IIa), (IIIa), (IVa), (Va) and (VIa), y=x and z=0 are preferred.

Particularly preferred compounds of general formula (IIb) are: Na _3-2y (K _1-ab Rb _a Cs _b ) _1-2z Mg ₇ (P _1-c As _c O ₄ ) ₆ : Eu _x (IIIb), K _{3 -2y} (Na _1-ab Rb _a Cs _b ) _1-2z Mg ₇ (P _1-c As _c O ₄ ) ₆ :Eu _x (IVb), Rb _3-2y (Na _1-ab K _a Cs _b ) _{1 -2z} Mg ₇ (P _1-c As _c O ₄ ) ₆ :Eu _x (Vb), Cs _3-2y (Na _1-ab K _a Rb _b ) _1-2z Mg ₇ (P _1-c As _c O ₄ ) ₆ : Eu _x (VIb), where: 0 ≤ a ≤ 1, preferably 0.0 ≤ a ≤ 0.5; 0 ≤ b ≤ 1, preferably 0.0 ≤ b ≤ 0.5; 0 ≤ a + b ≤ 1; 0 ≤ c ≤ 1, preferably 0.0 ≤ c ≤ 0.5; 0 ≤ y ≤ 1; 0 ≤ z ≤ 1; y + z = x; and 0 ＜ x ≤ 1.

In the general formulae (IIIb), (IVb), (Vb) and (VIb), preferably c=0 or c=1.

In the general formulae (IIb), (IIIb), (IVb), (Vb) and (VIb), y=z=x/2 is preferred.

In addition, the following preferably applies to the parameter x in the above-mentioned general formula: 0 <x <1, more preferably 0.0 <x ≤ 0.5, more preferably 0.001 ≤ x ≤ 0.1, and more preferably 0.001 ≤ x ≤ 0.05 and particularly preferably 0.001 ≤ x ≤ 0.04.

It has been found that the compound doped with 1% Eu ²⁺ (x=0.03) achieves a quantum efficiency of 71% at an excitation wavelength of 350 nm. In the case of a compound doped with 0.1% Eu ²⁺ (x=0.003), the quantum efficiency is increased to 88%.

Therefore, the following is particularly preferably applicable to the general formula mentioned above: 0.001 ≤ x ≤ 0.005, more preferably 0.002 ≤ x ≤ 0.004.

The compound according to the present invention may preferably be coated with another compound on its surface, as described below.

The present invention further relates to a method for preparing a compound of the above-mentioned general formula according to the present invention, which comprises the following steps: a) preparing a mixture containing M ^I , M ^II , AO ₄ , RE and optionally Li ; And b) The mixture prepared by calcination.

The mixture in the preparation step a) is carried out by mixing a salt containing M ^I , M ^II , AO ₄ , RE and optionally Li. The individual salts in step a) can be added and mixed in any desired order. The mixture prepared in step b) preferably includes M ^I , M ^II , AO ₄ , RE in the mixing ratios pre-specified by the general formula I, and optionally Li.

Preferred salts containing M ^I are carbonate M ^I ₂ CO ₃ , such as Na ₂ CO ₃ , K ₂ CO ₃ , Rb ₂ CO ₃ and Cs ₂ CO ₃ ; oxalate M ^I ₂ C ₂ O ₄ , such as Na ₂ C ₂ O ₄ , K ₂ C ₂ O ₄ , Rb ₂ C ₂ O ₄ and Cs ₂ C ₂ O ₄ ; oxides M ^I ₂ O, such as Na ₂ O, K ₂ O, Rb ₂ O and Cs ₂ O ; Hydroxide M ^I OH, such as NaOH, KOH, RbOH and CsOH; M ^I phosphate, such as NaH ₂ PO ₄ , Na ₂ HPO ₄ , Na ₃ PO ₄ , Na ₄ P ₂ O ₇ , Na ₅ P ₃ O ₁₀ and Na ₂ P ₄ O ₁₁ , KH ₂ PO ₄ , K ₂ HPO ₄ , K ₃ PO ₄ , K ₄ P ₂ O ₇ , K ₅ P ₃ O ₁₀ and K ₂ P ₄ O ₁₁ , RbH ₂ PO ₄ , Rb ₂ HPO ₄ , Rb ₃ PO ₄ , Rb ₄ P ₂ O ₇ , Rb ₅ P ₃ O ₁₀ and Rb ₂ P ₄ O ₁₁ , CsH ₂ PO ₄ , Cs ₂ HPO ₄ , Cs ₃ PO ₄ , Cs ₄ P ₂ O ₇ , Cs ₅ P ₃ O ₁₀ and Cs ₂ P ₄ O ₁₁ ; and nitrate M ^I NO ₃ , such as NaNO ₃ , KNO ₃ , RbNO ₃ and CsNO ₃ .

The preferred salt is a carbonate containing M ^II M ^II CO _3, such as _{MgCO 3, CaCO 3, SrCO 3} , BaCO 3, CuCO 3 and ZnCO _3; mixed carbonate / hydroxide compound M ^II CO ₃ · M ^II ( OH) ₂ ·xH ₂ O, such as MgCO ₃ ·Mg(OH) ₂ ·5H ₂ O, CaCO ₃ ·Ca(OH) ₂ ·5H ₂ O, SrCO ₃ ·Sr(OH) ₂ ·5H ₂ O, BaCO ₃ ·Ba(OH) ₂ ·5H ₂ O, CuCO ₃ ·Cu(OH) ₂ ·5H ₂ O and ZnCO ₃ ·Zn(OH) ₂ ·5H ₂ O; oxalate M ^II C ₂ O ₄ , such as MgC ₂ O ₄ , CaC ₂ O ₄ , SrC ₂ O ₄ , BaC ₂ O ₄ , CuC ₂ O ₄ and ZnC ₂ O ₄ ; oxide M ^II O, such as MgO, CaO, SrO, BaO, CuO and ZnO; hydroxide M ^II (OH) ₂ , such as Mg(OH) ₂ , Ca(OH) ₂ , Sr(OH) ₂ , Ba(OH) ₂ , Cu(OH) ₂ and Zn(OH) ₂ ; nitrate M ^II (NO ₃ ) ₂ , such as Mg(NO ₃ ) ₂ , Ca(NO ₃ ) ₂ , Sr(NO ₃ ) ₂ , Ba(NO ₃ ) ₂ , Cu(NO ₃ ) ₂ and Zn(NO ₃ ) ₂ ; M ^II phosphoric acid Salts, such as Mg(H ₂ PO ₄ ) ₂ , MgHPO ₄ , Mg ₃ (PO ₄ ) ₂ , Mg ₂ P ₂ O ₇ , Mg ₂ P ₄ O ₁₂ and MgP ₄ O ₁₁ ; and M ^II carboxylate compounds, Such as citrate, lactate and ascorbate.

The preferred salt series ammonium salt (NH ₄ ) ₃ AO ₄ containing AO ₄ , such as (NH ₄ ) ₃ PO ₄ , (NH ₄ ) ₃ AsO ₄ , (NH ₄ ) ₃ SbO ₄ , (NH ₄ ) ₃ VO ₄ And (NH ₄ ) ₃ NbO ₄ ; Hydrogen ammonium salt (NH ₄ ) ₂ HAO ₄ , such as (NH ₄ ) ₂ HPO ₄ , (NH ₄ ) ₂ HAsO ₄ , (NH ₄ ) ₂ HSbO ₄ , (NH ₄ ) ₂ HVO ₄ and (NH ₄ ) ₂ HNbO ₄ ; and dihydroammonium salt (NH ₄ )H ₂ AO ₄ , such as (NH ₄ )H ₂ PO ₄ , (NH ₄ )H ₂ AsO ₄ , (NH ₄ )H ₂ SbO ₄ , (NH ₄ )H ₂ VO ₄ and (NH ₄ ) ₂ HNbO ₄ .

The preferred salts containing RE are EuO, YbO, SmO, Eu ₂ O ₃ , Yb ₂ O ₃ , Sm ₂ O ₃ , MnO ₂ , MnCO ₃ and MnC ₂ O ₄ ·2H ₂ O.

The preferred salts containing Li are Li ₂ CO ₃ , Li ₂ C ₂ O ₄ , Li ₂ O, LiOH and LiNO ₃ .

The preparation of the mixture can be carried out at a temperature between -10 and 100°C, preferably between 0 and 50°C, more preferably between 10 and 40°C, and most preferably between 15 and 30°C.

In step a), the salt containing M ^I , M ^II , AO ₄ , RE and Li is preferably suspended in a non-polar or polar aprotic solvent and mixed with each other until dry. This can preferably be done by means of an ultrasonic bath and/or an agate mortar.

Suitable non-polar or polar aprotic solvents are, for example, aliphatic or aromatic hydrocarbons such as pentane, hexane, heptane, octane, benzene and toluene; halogenated hydrocarbons such as trichloromethane and CCl ₄ ; and acetone and acetonitrile .

The calcination of the mixture prepared in step b) is preferably carried out under reducing conditions. The reaction here is usually carried out at a temperature higher than 800°C, preferably in the range between 850 and 1100°C. The reduction conditions are preferably achieved by a reducing atmosphere in which the mixture is calcined. Therefore, preferably, the calcination in step b) is carried out in the presence of carbon monoxide, nitrogen, hydrogen and/or synthesis gas and/or in a vacuum. It is particularly preferable to establish a reducing nitrogen/hydrogen atmosphere, such as 5 to 70% N ₂ and 95 to 30% H ₂ , or, for example, 70 to 95% N ₂ and 30 to 5% H ₂ . Very particularly preferred is a reducing nitrogen/hydrogen atmosphere containing 70% H ₂ and 30% N ₂ or containing 90% N ₂ and 10% H ₂ .

The calcination of the mixture prepared in step b) is preferably carried out within a period of 0.1 to 24 h, more preferably 4 to 20 h, also more preferably 6 to 14 h, and most preferably 10 to 14 h.

After the calcination in step b), the desired compound of the present invention as a luminescent material is obtained.

In another embodiment, the compounds of the invention may be coated. All suitable for this purpose are all coating methods for phosphors known to those skilled in the art from the prior art. In detail, suitable materials for coating are amorphous carbon (diamond-like carbon (DLC)), metal oxides, metal fluorides and metal nitrides, especially alkaline earth metals such as Al ₂ O ₃ Oxides, alkaline earth metal fluorides such as CaF ₂ and alkaline earth metal nitrides such as AlN, and SiO ₂ . The coating here can be carried out, for example, by a fluidized bed method or a wet chemical method. Suitable coating methods are, for example, known from JP 04-304290, WO 91/10715, WO 99/27033, US 2007/0298250, WO 2009/065480 and WO 2010/075908, and these methods are incorporated herein by reference. in. On the one hand, the goal of coating is the higher stability of the compound, such as air or moisture. However, the goal can also be to improve the coupling of light in and out by appropriately selecting the coating surface and the refractive index of the coating material.

The present invention further relates to the use of the compounds according to the present invention as phosphors or conversion phosphors, especially for partially or completely converting UV light and/or violet light into lower energy light, that is, light with longer wavelength . Particularly preferred is the use of the compounds according to the present invention as phosphors or conversion phosphors for partially or completely converting light in the UV and violet spectral range of about 250 to 430 nm into light with longer wavelengths .

Therefore, the compounds according to the present invention are also called phosphors.

The invention further relates to a radiation conversion mixture comprising a compound according to the invention. The radiation conversion mixture can be composed of one or more compounds according to the present invention and will therefore be equivalent to the term "phosphor" or "conversion phosphor" as defined above.

In addition to a compound according to the invention, the radiation conversion mixture preferably contains one or more other luminescent materials. Preferably, the other luminescent material is a conversion phosphor different from the compound according to the present invention, or a semiconductor nanoparticle (quantum material).

In a particularly preferred embodiment, the radiation conversion mixture comprises a compound according to the invention and another conversion phosphor. The compound according to the present invention and another conversion phosphor each emit a complementary wavelength light system extremely particularly preferred.

In an alternative particularly preferred embodiment, the radiation conversion mixture comprises a compound according to the invention and a quantum material. The compound and quantum material according to the present invention each emit light of complementary wavelengths, which are extremely preferred.

In another alternative particularly preferred embodiment, the radiation conversion mixture comprises a compound according to the invention, a conversion phosphor and a quantum material.

If the compound according to the present invention is used in small amounts, it already produces good LED quality. Here, the LED quality is described with the help of conventional parameters, such as color rendering index (CRI), correlated color temperature (CCT), lumen equivalent or absolute lumen, or the color point in the CIE x and y coordinates.

Color Rendering Index (CRI) is a dimensionless light measurement that is familiar to those familiar with this technology. It compares the faithfulness of color reproduction of artificial light sources with that of daylight or filament light sources (the latter two have a CRI of 100). .

Correlated Color Temperature (CCT) is a light metering quantity familiar to those who are familiar with this technology, and the unit is kelvin. The higher the value, the greater the blue content of the light, and the colder the white light from the artificial radiation source presented to the observer. CCT follows the concept of blackbody radiator, and its color temperature describes the so-called Planck curve in the CIE diagram.

Lumen equivalent is the light metering quantity familiar to those who are familiar with this technology, the unit is lm/W, which describes the measurement value of the light source's metering luminous flux (unit: lumens) under a specific radiation measurement radiation power (unit: watt) . The higher the lumen equivalent, the more effective the light source.

The unit of luminous flux in lumens is the amount of light that is familiar to those familiar with this technology, which describes the luminous flux of a light source, which is a measure of the total visible light radiation emitted by the radiation source. The greater the luminous flux, the brighter the light source presented to the observer.

CIE x and CIE y represent the coordinates in the standard CIE color chart (here, standard observer 1931) familiar to those who are familiar with the technology, and describe the color of the light source by means of them.

All the above quantities can be calculated from the emission spectrum of the light source using methods known to those skilled in the art.

The excitability of the phosphor according to the present invention extends over a wide range, which extends from about 250 to about 430 nm, preferably from about 250 to about 405 nm, where the absorption maximum is between 250 and 325 nm.

The invention further relates to a light source comprising at least one primary light source and at least one compound according to the invention or a radiation conversion mixture according to the invention. Here, the maximum emission of the primary light source is preferably in the range of about 250 to about 430 nm, preferably in the range of about 250 to about 405 nm, wherein the main radiation is partially or completely converted by the phosphor according to the present invention to have more Long-wavelength radiation.

In a preferred embodiment of the light source according to the present invention, the primary light source comprises luminescent indium aluminum gallium nitride, especially the formula In _i Ga _j Al _k N, where 0 ≤ i, 0 ≤ j, 0 ≤ k, and i + j + K = 1.

The possible forms of this type of light source are known to those familiar with the art. These can be light-emitting LED chips of various structures.

In another preferred embodiment of the light source according to the present invention, the primary light source is a light-emitting configuration based on ZnO, TCO (transparent conducting oxide), ZnSe or SiC or based on an organic light-emitting layer (organic light-emitting layer). layer, OLED) configuration.

In another preferred embodiment of the light source according to the present invention, the primary light source is a source that exhibits electroluminescence and/or photoluminescence. The primary light source can also be a plasma source or discharge source.

The corresponding light source according to the present invention is also called a light emitting diode or LED. The light source according to the present invention can be used for signal transmission, lighting, backlighting, projection, decoration or for photochemical purposes.

The compound according to the present invention can be used alone or as a mixture with other luminescent materials familiar to those skilled in the art. In principle, the corresponding other luminescent materials applicable to the mixture are conversion phosphors or quantum materials.

In particular, the compound according to the present invention exhibits advantages when mixed with other luminescent materials of other fluorescent colors or used with such other luminescent materials in LEDs.

It is particularly preferred to include a mixture of one or more other luminescent materials in addition to the compound according to the present invention, which luminescent materials emit between 480 and 700 nm in order to obtain a white LED.

In another preferred embodiment, the compound according to the invention is used as a single phosphor. The compound according to the present invention also exhibits excellent results when used as a single phosphor because of the broad emission spectrum with high blue content.

The conversion phosphors that can be used with the compounds according to the invention and thus form the radiation conversion mixtures according to the invention are not subject to any specific restrictions. Therefore, it is generally possible to use any possible conversion phosphor. In detail, the suitable ones here are: Ba ₂ SiO ₄ :Eu ²⁺ , Ba ₃ SiO ₅ :Eu ²⁺ , (Ba,Ca) ₃ SiO ₅ :Eu ²⁺ , BaSi ₂ N ₂ O ₂ :Eu, BaSi ₂ O ₅ : Pb ²⁺ , Ba ₃ Si ₆ O ₁₂ N ₂ : Eu, Ba _x Sr _1-x F ₂ : Eu ²⁺ (where 0 ≤ x ≤ 1), BaSrMgSi ₂ O ₇ : Eu ²⁺ , BaTiP ₂ O ₇ , (Ba,Ti) ₂ P ₂ O ₇ : Ti, BaY ₂ F ₈ : Er ³⁺ , Yb ⁺ , Be ₂ SiO ₄ : Mn ²⁺ , Bi ₄ Ge ₃ O ₁₂ , CaAl ₂ O ₄ : Ce ³⁺ , CaLa ₄ O ₇ : Ce ³⁺ , CaAl ₂ O ₄ : Eu ²⁺ , CaAl ₂ O ₄ : Mn ²⁺ , CaAl ₄ O ₇ : Pb ²⁺ , Mn ²⁺ , CaAl ₂ O ₄ : Tb ³⁺ , Ca ₃ Al ₂ Si ₃ O ₁₂ : Ce ³⁺ , Ca ₃ Al ₂ Si ₃ O ₁₂ : Ce ³⁺ , Ca ₃ Al ₂ Si ₃ O ₁₂ : Eu ²⁺ , Ca ₂ B ₅ O ₉ Br :Eu ²⁺ , Ca ₂ B ₅ O ₉ Cl: Eu ²⁺ , Ca ₂ B ₅ O ₉ Cl: Pb ²⁺ , CaB ₂ O ₄ : Mn ²⁺ , Ca ₂ B ₂ O ₅ : Mn ²⁺ , CaB ₂ O ₄ : Pb ²⁺ , CaB ₂ P ₂ O ₉ : Eu ²⁺ , Ca ₅ B ₂ SiO ₁₀ : Eu ³⁺ , Ca _0.5 Ba _0.5 Al ₁₂ O ₁₉ : Ce ³⁺ , Mn ²⁺ , Ca ₂ Ba ₃ (PO ₄ ) ₃ Cl:Eu ²⁺ , SiO ₂ containing CaBr ₂ : Eu ²⁺ , SiO ₂ containing CaCl ₂ : Eu ²⁺ , SiO ₂ containing CaCl ₂ : Eu ²⁺ , Mn ²⁺ , SiO ₂ , CaF ₂ : Ce ³⁺ , CaF ₂ : Ce ³⁺ , Mn ²⁺ , CaF ₂ : Ce ³⁺ , Tb ³⁺ , CaF ₂ : Eu ²⁺ , CaF ₂ : Mn ²⁺ , CaGa ₂ O ₄ : Mn ²⁺ , CaGa ₄ O ₇ : Mn ²⁺ , CaGa ₂ S ₄ : Ce ³⁺ , CaGa ₂ S ₄ : Eu ²⁺ , CaGa ₂ S ₄ : Mn ²⁺ , CaGa ₂ S ₄ : ^{_{Pb 2+, CaGeO 3: Mn 2+}} , containing CaI _2: Eu ²⁺ of SiO _2, containing CaI _2: Eu ^2+, Mn ²⁺ of ^{_{SiO 2, CaLaBO 4: Eu 3+}} , CaLaB 3 O 7: Ce ³⁺ , Mn ²⁺ , Ca ₂ La ₂ BO _6.5 : Pb ²⁺ , Ca ₂ MgSi ₂ O ₇ , Ca ₂ MgSi ₂ O ₇ : Ce ³⁺ , CaMgSi ₂ O ₆ : Eu ²⁺ , Ca ₃ MgSi ₂ O ₈ : Eu ²⁺ , Ca ₂ MgSi ₂ O ₇ : Eu ²⁺ , CaMgSi ₂ O ₆ : Eu ²⁺ , Mn ²⁺ , Ca ₂ MgSi ₂ O ₇ : Eu ²⁺ , Mn ²⁺ , CaMoO ₄ , CaMoO ₄ :Eu ³⁺ , CaO:Bi ³⁺ , CaO:Cd ²⁺ , CaO:Cu ⁺ , CaO:Eu ³⁺ , CaO:Eu ³⁺ ,Na ⁺ , CaO:Mn ²⁺ , CaO:Pb ²⁺ , CaO :Sb ³⁺ , CaO:Sm ³⁺ , CaO:Tb ³⁺ , CaO:Tl, CaO:Zn ²⁺ , Ca ₂ P ₂ O ₇ :Ce ³⁺ , α-Ca ₃ (PO ₄ ) ₂ :Ce ^{3 +} , Β-Ca ₃ (PO ₄ ) ₂ : Ce ³⁺ , Ca ₅ (PO ₄ ) ₃ Cl: Eu ²⁺ , Ca ₅ (PO ₄ ) ₃ Cl: Mn ²⁺ , Ca ₅ (PO ₄ ) ₃ Cl : Sb ³⁺ , Ca ₅ (PO ₄ ) ₃ Cl: Sn ²⁺ , β-Ca ₃ (PO ₄ ) ₂ : Eu ²⁺ , Mn ²⁺ , Ca ₅ (PO ₄ ) ₃ F: Mn ²⁺ , Ca ₅ (PO ₄ ) ₃ F: Sb ³⁺ , Ca ₅ (PO ₄ ) ₃ F: Sn ²⁺ , α-Ca ₃ (PO ₄ ) ₂ : Eu ²⁺ , β-Ca ₃ (PO ₄ ) ₂ : Eu ²⁺ , Ca ₂ P ₂ O ₇ : Eu ²⁺ , Ca ₂ P ₂ O ₇ : Eu ²⁺ , Mn ²⁺ , CaP ₂ O ₆ : Mn ²⁺ , α-Ca ₃ (PO ₄ ) ₂ : Pb ^{2 +} , Α-Ca ₃ (PO ₄ ) ₂ : Sn ²⁺ , β-Ca ₃ (PO ₄ ) ₂ : Sn ²⁺ , β-Ca ₂ P ₂ O ₇ : Sn, Mn, α-Ca ₃ (PO ₄ ) ₂ :Tr, CaS:Bi ³⁺ , CaS:Bi ³⁺ , Na, CaS: Ce ³⁺ , CaS: Eu ²⁺ , CaS: Cu ⁺ , Na ⁺ , CaS: La ³⁺ , CaS: Mn ²⁺ , CaSO ₄ : Bi, CaSO ₄ : Ce ³⁺ , CaSO ₄ : Ce ³⁺ ,Mn ²⁺ , CaSO ₄ :Eu ²⁺ , CaSO ₄ :Eu ²⁺ ,Mn ²⁺ , CaSO ₄ :Pb ²⁺ , CaS:Pb ²⁺ , CaS:Pb ²⁺ ,Cl, CaS:Pb ²⁺ , Mn ²⁺ , CaS: Pr ³⁺ , Pb ²⁺ , Cl, CaS: Sb ³⁺ , CaS: Sb ³⁺ , Na, CaS: Sm ³⁺ , CaS: Sn ²⁺ , CaS: Sn ²⁺ , F, CaS: Tb ³⁺ , CaS: Tb ³⁺ , Cl, CaS: Y ³⁺ , CaS: Yb ²⁺ , CaS: Yb ²⁺ , Cl, CaSc ₂ O ₄ : Ce, Ca ₃ (Sc, Mg ) ₂ Si ₃ O ₁₂ : Ce, CaSiO ₃ : Ce ³⁺ , Ca ₃ SiO ₄ Cl ₂ : Eu ²⁺ , Ca ₃ SiO ₄ Cl ₂ : Pb ²⁺ , CaSiO ₃ : Eu ²⁺ , Ca ₃ SiO ₅ : Eu ²⁺ , (Ca,Sr) ₃ SiO ₅ :Eu ²⁺ , (Ca,Sr) ₃ MgSi ₂ O ₈ :Eu ²⁺ , (Ca,Sr) ₃ MgSi ₂ O ₈ :Eu ²⁺ ,Mn ²⁺ , CaSiO ₃ : Mn ²⁺ , Pb, CaSiO ₃ : Pb ²⁺ , CaSiO ₃ : Pb ²⁺ , Mn ²⁺ , CaSiO ₃ : Ti ⁴⁺ , CaSr ₂ (PO ₄ ) ₂ : Bi ³⁺ , β-( Ca,Sr) ₃ (PO ₄ ) ₂ : Sn ²⁺ Mn ²⁺ , CaTi _0.9 Al _0.1 O ₃ : Bi ³⁺ , CaTiO ₃ : Eu ³⁺ , CaTiO ₃ : Pr ³⁺ , Ca ₅ (VO ₄ ) _{3 cl, CaWO 4, CaWO 4:} Pb 2+, CaWO 4: W, Ca 3 WO 6: U, CaYAlO 4: Eu 3+, CaYBO 4: Bi 3+, CaYBO 4:. Eu 3+, CaYB 0 8 O ₃ , ₇ : Eu ³⁺ , CaY ₂ ZrO ₆ : Eu ³⁺ , (Ca, Zn, Mg) ₃ (PO ₄ ) ₂ : Sn, (Ce, Mg) BaAl ₁₁ O ₁₈ : Ce, (Ce, Mg) SrAl ₁₁ O ₁₈ : Ce, CeMgAl ₁₁ O ₁₉ : Ce: Tb, Cd ₂ B ₆ O ₁₁ : Mn ²⁺ , CdS: Ag ⁺ , Cr, CdS: In, CdS: In, CdS: In, Te, CdS: Te, _{CdWO 4, CsF, Csl, CsI} : Na +, CsI: Tl, (ErCl 3) 0.25 (BaCl 2) 0 75, GaN:. Zn, Gd 3 Ga 5 O 12: Cr 3+, Gd 3 Ga 5 O 12 :Cr,Ce, GdNbO ₄ :Bi ³⁺ , Gd ₂ O ₂ S: Eu ³⁺ , Gd ₂ O ₂ Pr ³⁺ , Gd ₂ O ₂ S: Pr, Ce, F, Gd ₂ O ₂ S: Tb ^{3 +} , Gd ₂ SiO ₅ : Ce ³⁺ , KAI ₁₁ O ₁₇ : Tl ⁺ , KGa ₁₁ O ₁₇ : Mn ²⁺ , K ₂ La ₂ Ti ₃ O ₁₀ : Eu, KMgF ₃ : Eu ²⁺ , KMgF ₃ : Mn ²⁺ , K ₂ SiF ₆ : Mn ⁴⁺ , LaAl ₃ B ₄ O ₁₂ : Eu ³⁺ , LaAlB ₂ O ₆ : Eu ³⁺ , LaAlO ₃ : Eu ³⁺ , LaAlO ₃ : Sm ³⁺ , LaAsO ₄ : Eu ³⁺ , LaBr ₃ : Ce ³⁺ , LaBO ₃ : Eu ³⁺ , LaCl ₃ : Ce ³⁺ , La ₂ O ₃ : Bi ³⁺ , LaOBr: Tb ³⁺ , LaOBr: Tm ³⁺ , LaOCl: Bi ^{3+ , LaOCl: Eu 3+, LaOF:} Eu 3+, La 2 O 3: Eu 3+, La 2 O 3: Pr 3+, La 2 O 2 S: Tb 3+, LaPO 4: Ce 3+, LaPO 4 :Eu ³⁺ , LaSiO ₃ Cl: Ce ³⁺ , LaSiO ₃ Cl: Ce ³⁺ , Tb ³⁺ , LaVO ₄ : Eu ³⁺ , La ₂ W ₃ O ₁₂ : Eu ³⁺ , LiAlF ₄ : Mn ²⁺ , LiAl ₅ O ₈ : Fe ³⁺ , LiAlO ₂ : Fe ³⁺ , LiAlO ₂ : Mn ²⁺ , LiAl ₅ O ₈ : Mn ²⁺ , Li ₂ CaP ₂ O ₇ : Ce ³⁺ , Mn ²⁺ , LiCeBa ₄ Si ₄ O ₁₄ : Mn ²⁺ , LiCeSrBa ₃ Si ₄ O ₁₄ : Mn ²⁺ , LiInO ₂ : Eu ³⁺ , LiInO ₂ : Sm ³⁺ , LiLaO ₂ : Eu ³⁺ , LuAlO ₃ : Ce ³⁺ , (Lu, Gd) ₂ SiO ₅ : Ce ³⁺ , Lu ₂ SiO ₅ : Ce ³⁺ , Lu ₂ Si ₂ O ₇ : Ce ³⁺ , LuTaO ₄ : Nb ⁵⁺ , Lu _1-x Y _x AlO ₃ : Ce ³⁺ (where 0 ≤ x ≤ 1), (Lu,Y) ₃ (Al,Ga,Sc) ₅ O ₁₂ :Ce , MgAl ₂ O ₄ : Mn ²⁺ , MgSrAl ₁₀ O ₁₇ : Ce, MgB ₂ O ₄ : Mn ²⁺ , MgBa ₂ (PO ₄ ) ₂ : Sn ²⁺ , MgBa ₂ (PO ₄ ) ₂ : U, MgBaP ₂ O ₇ : Eu ²⁺ , MgBaP ₂ O ₇ : Eu ²⁺ , Mn ²⁺ , MgBa ₃ Si ₂ O ₈ : Eu ²⁺ , MgBa(SO ₄ ) ₂ : Eu ²⁺ , Mg ₃ Ca ₃ (PO ₄ ) ₄ : Eu ²⁺ , MgCaP ₂ O ₇ : Mn ²⁺ , Mg ₂ Ca(SO ₄ ) ₃ : Eu ²⁺ , Mg ₂ Ca(SO ₄ ) ₃ : Eu ²⁺ , Mn ² , MgCeAl _n O ₁₉ : Tb ³⁺ , Mg ₄ (F)GeO ₆ : Mn ²⁺ , Mg ₄ (F)(Ge,Sn)O ₆ : Mn ²⁺ , MgF ₂ : Mn ²⁺ , MgGa ₂ O ₄ : Mn ²⁺ , Mg ₈ Ge ₂ O ₁₁ F ₂ : Mn ⁴⁺ , MgS: Eu ²⁺ , MgSiO ₃ : Mn ²⁺ , Mg ₂ SiO ₄ : Mn ²⁺ , Mg ₃ SiO ₃ F ₄ : Ti ⁴⁺ , MgSO ₄ : Eu ²⁺ , MgSO ₄ : Pb ²⁺ , MgSrBa ₂ Si ₂ O ₇ : Eu ²⁺ , MgSrP ₂ O ₇ : Eu ²⁺ , MgSr ₅ (PO ₄ ) ₄ : Sn ²⁺ , MgSr ₃ Si ₂ O ₈ : Eu ²⁺ , Mn ²⁺ , Mg ₂ Sr(SO ₄ ) ₃ : Eu ²⁺ , Mg ₂ TiO ₄ : Mn ⁴⁺ , MgWO ₄ , MgYBO ₄ : Eu ³⁺ , M ₂ MgSi ₂ O ₇ : Eu ²⁺ (M = Ca, Sr and/or Ba), M ₂ MgSi ₂ O ₇ : Eu ²⁺ , Mn ²⁺ (M = Ca, Sr and/or Ba), M ₂ MgSi ₂ O ₇ : Eu ²⁺ ,Zr ⁴⁺ (M = Ca, Sr and/or Ba), M ₂ MgSi ₂ O ₇ : Eu ²⁺ ,Mn ²⁺ , Zr ⁴⁺ (M = Ca, Sr and/or Ba), Na ₃ Ce(PO ₄ ) ₂ : Tb ³⁺ , Na _1.23 K _0.42 Eu _0.12 TiSi ₄ O ₁₁ : Eu ³⁺ , Na _1.23 K _0.42 Eu _0.12 TiSi ₅ O ₁₃ •xH ₂ O: Eu ³⁺ , Na _1.29 K _0.46 Er _0.08 TiSi ₄ O ₁₁ : Eu ³⁺ , Na ₂ Mg ₃ Al ₂ Si ₂ O ₁₀ : Tb, Na(Mg _2-x Mn _x ) LiSi ₄ O ₁₀ F ₂ : Mn (where 0 ≤ x ≤ 2), NaYF ₄ : Er ³⁺ ,Yb ³⁺ , NaYO ₂ : Eu ³⁺ , P46(70%) + P47 (30%), β-SiAlON: Eu, SrAl ₁₂ O ₁₉ : Ce ³⁺ , Mn ²⁺ , SrAl ₂ O ₄ :Eu ²⁺ , SrAl ₄ O ₇ :Eu ³⁺ , SrAl ₁₂ O ₁₉ :Eu ²⁺ , SrAl ₂ S ₄ :Eu ²⁺ , Sr ₂ B ₅ O ₉ Cl: Eu ²⁺ , SrB ₄ O ₇ :Eu ²⁺ (F,Cl,Br), SrB ₄ O ₇ :Pb ²⁺ , SrB ₄ O ₇ :Pb ²⁺ ,Mn ²⁺ , SrB ₈ O ₁₃ :Sm ²⁺ , Sr _x Ba _y Cl _z Al ₂ O _4-z/2 : Mn ²⁺ , Ce ³⁺ , SrBaSiO ₄ : Eu ²⁺ , (Sr,Ba) ₃ SiO ₅ : Eu, (Sr,Ca)Si ₂ N ₂ O ₂ : Eu, containing Sr _{(Cl, Br, I) 2} : Eu 2+ of SiO _2, containing SrCl _2: Eu ²⁺ of _{SiO 2, Sr 5 Cl (PO} 4) 3: Eu, Sr w F x B 4 O 6.5: Eu 2+ , Sr _w F _x B _y O _z :Eu ²⁺ ,Sm ²⁺ , SrF ₂ :Eu ²⁺ , SrGa ₁₂ O ₁₉ :Mn ²⁺ , SrGa ₂ S ₄ :Ce ³⁺ , SrGa ₂ S ₄ :Eu ^{2 +} , Sr _2-y Ba _y SiO ₄ : Eu (where 0 ≤ y ≤ 2), SrSi ₂ O ₂ N ₂ : Eu, SrGa ₂ S ₄ : Pb ²⁺ , SrIn ₂ O ₄ : Pr ³⁺ ,Al ³⁺ , (Sr,Mg) ₃ (PO ₄ ) ₂ : Sn, SrMgSi ₂ O ₆ : Eu ²⁺ , Sr ₂ MgSi ₂ O ₇ : Eu ²⁺ , Sr ₃ MgSi ₂ O ₈ :Eu ²⁺ , SrMoO ₄ :U, SrO•3B ₂ O ₃ :Eu ²⁺ ,Cl, β-SrO•3B ₂ O ₃ :Pb ²⁺ , β-SrO•3B ₂ O ₃ :Pb ²⁺ ,Mn ²⁺ , α-SrO•3B ₂ O ₃ :Sm ²⁺ , Sr ₆ P ₅ BO ₂₀ :Eu, Sr ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ , Sr ₅ (PO ₄ ) ₃ Cl:Eu ²⁺ ,Pr ³⁺ , Sr ₅ (PO ₄ ) ₃ Cl: Mn ²⁺ , Sr ₅ (PO ₄ ) ₃ Cl: Sb ³⁺ , Sr ₂ P ₂ O ₇ : Eu ²⁺ , β-Sr ₃ (PO ₄ ) ₂ : Eu ²⁺ , Sr ₅ (PO ₄ ) ₃ F: Mn ²⁺ , Sr ₅ (PO ₄ ) ₃ F: Sb ³⁺ , Sr ₅ (PO ₄ ) ₃ F: Sb ³⁺ , Mn ²⁺ , Sr ₅ (PO ₄ ) ₃ F: Sn ²⁺ , Sr ₂ P ₂ O ₇ : Sn ²⁺ , β-Sr ₃ (PO ₄ ) ₂ : Sn ²⁺ , β-Sr ₃ (PO ₄ ) ₂ : Sn ²⁺ , Mn ²⁺ (Al), SrS: Ce ³⁺ , SrS: Eu ²⁺ , SrS: Mn ²⁺ , SrS: Cu ⁺ , Na, SrSO ₄ : Bi, SrSO ₄ : Ce ³⁺ , SrSO ₄ : Eu ^{2 +} , SrSO ₄ : Eu ²⁺ , Mn ²⁺ , Sr ₅ Si ₄ O ₁₀ Cl ₆ : Eu ²⁺ , Sr ₂ SiO ₄ : Eu ²⁺ , Sr ₃ SiO ₅ : Eu ²⁺ , (Sr,Ba) ₃ SiO ₅ : Eu ²⁺ , SrTiO ₃ : Pr ³⁺ , SrTiO ₃ : Pr ³⁺ , Al ³⁺ , SrY ₂ O ₃ : Eu ³⁺ , ThO ₂ : Eu ³⁺ , ThO ₂ : Pr ³⁺ , ThO ₂ : Tb ³⁺ , YAl ₃ B ₄ O ₁₂ : Bi ³⁺ , YAl ₃ B ₄ O ₁₂ : Ce ³⁺ , YAl ₃ B ₄ O ₁₂ : Ce ³⁺ , Mn, YAl ₃ B ₄ O ₁₂ : Ce ³⁺ ,Tb ³⁺ 、YAl ₃ B ₄ O ₁₂ :Eu ^{3 +} , YAl ₃ B ₄ O ₁₂ : Eu ³⁺ , Cr ³⁺ , YAl ₃ B ₄ O ₁₂ : Th ⁴⁺ , Ce ³⁺ , Mn ²⁺ , YAlO ₃ : Ce ³⁺ , Y ₃ Al ₅ O ₁₂ : Ce ³⁺ , Y ₃ Al ₅ O ₁₂ : Cr ³⁺ , YAlO ₃ : Eu ³⁺ , Y ₃ Al ₅ O ₁₂ : Eu ^3r , Y ₄ Al ₂ O ₉ : Eu ³⁺ , Y ₃ Al ₅ O ₁₂ : Mn ⁴⁺ , YAlO ₃ : Sm ³⁺ , YAlO ₃ : Tb ³⁺ , Y ₃ Al ₅ O ₁₂ : Tb ³⁺ , YAsO ₄ : Eu ³⁺ , YBO ₃ : Ce ³⁺ , YBO ₃ : Eu ³⁺ , YF ₃ : Er ³⁺ , Yb ³⁺ , YF ₃ : Mn ²⁺ , YF ₃ : Mn ²⁺ , Th ⁴⁺ , YF ₃ : Tm ³⁺ , Yb ³⁺ , (Y, Gd) BO ₃ : Eu, (Y,Gd)BO ₃ :Tb, (Y,Gd) ₂ O ₃ :Eu ³⁺ , Y _1.34 Gd _0.60 O ₃ :(Eu,Pr), Y ₂ O ₃ :Bi ³⁺ , YOBr:Eu ³⁺ , Y ₂ O ₃ : Ce, Y ₂ O ₃ : Er ³⁺ , Y ₂ O ₃ : Eu ³⁺ , Y ₂ O ₃ : Ce ³⁺ , Tb ³⁺ , YOCl: Ce ³⁺ , YOCl: Eu ³⁺ , YOF:Eu ³⁺ , YOF:Tb ³⁺ , Y ₂ O ₃ :Ho ³⁺ , Y ₂ O ₂ S:Eu ³⁺ , Y ₂ O ₂ S:Pr ³⁺ , Y ₂ O ₂ S:Tb ^{3 +} , Y ₂ O ₃ : Tb ³⁺ , YPO ₄ : Ce ³⁺ , YPO ₄ : Ce ³⁺ , Tb ³⁺ , YPO ₄ : Eu ³⁺ , YPO ₄ : Mn ²⁺ , Th ⁴⁺ , YPO ₄ : V ⁵⁺ , Y(P,V)O ₄ : Eu, Y ₂ SiO ₅ : Ce ³⁺ , YTaO ₄ , YTaO ₄ : Nb ⁵⁺ , YVO ₄ : Dy ³⁺ , YVO ₄ : Eu ³⁺ , ZnAl ₂ O ₄ : Mn ²⁺ , ZnB ₂ O ₄ : Mn ²⁺ , ZnBa ₂ S ₃ : Mn ²⁺ , (Zn,Be) ₂ SiO ₄ : Mn ²⁺ , Zn _0.4 Cd _0.6 S: Ag, Zn _0.6 Cd _0.4 S: Ag, (Zn, Cd) S: Ag, Cl, (Zn, Cd) S: Cu, ZnF ₂ : Mn ²⁺ , ZnGa ₂ O ₄ , ZnGa ₂ O ₄ : Mn ²⁺ , ZnGa ₂ S ₄ : Mn ²⁺ , Zn ₂ GeO ₄ : Mn ²⁺ , (Zn,Mg)F ₂ : Mn ²⁺ , ZnMg ₂ ( PO ₄ ) ₂ : Mn ²⁺ , (Zn,Mg) ₃ (PO ₄ ) ₂ : Mn ²⁺ , ZnO: Al ³⁺ , Ga ³⁺ , ZnO: Bi ³⁺ , ZnO: Ga ³⁺ , ZnO: Ga , ZnO-CdO: Ga, ZnO: S, ZnO: Se, ZnO: Zn, ZnS: Ag ⁺ , Cl ^- , ZnS: Ag, Cu, Cl, ZnS: Ag, Ni, ZnS: Au, In, ZnS-CdS (25-75), ZnS-CdS (50-50), ZnS-CdS (75-25), ZnS-CdS: Ag, Br, Ni, ZnS-CdS: Ag ⁺ , Cl, ZnS-CdS: Cu, Br , ZnS-CdS: Cu, I , ZnS: Cl -, ZnS: Eu 2+, ZnS: Cu, ZnS: Cu +, Al 3+, ZnS: Cu +, Cl -, ZnS: Cu, Sn, ZnS: Eu ^{2+, ZnS: Mn 2+, ZnS} : Mn, Cu, ZnS: Mn 2+, Te 2+, ZnS: P, ZnS: P 3-, Cl -, ZnS: Pb 2+, ZnS: Pb 2+, ^{cl -, ZnS: Pb, Cu} , Zn 3 (PO 4) 2: Mn 2+, Zn 2 SiO 4: Mn 2+, Zn 2 SiO 4: Mn 2+, As 5+, Zn 2 SiO 4: Mn, Sb ₂ O ₂ , Zn ₂ SiO ₄ : Mn ²⁺ , P, Zn ₂ SiO ₄ : Ti ⁴⁺ , ZnS: Sn ²⁺ , ZnS: Sn, Ag, ZnS: Sn ²⁺ , Li ⁺ , ZnS: Te, Mn, ZnS-ZnTe: Mn ²⁺ , ZnSe: Cu ⁺ , Cl and ZnWO ₄ .

The preferred quantum materials that can be used with the compounds according to the invention and form the radiation conversion mixtures according to the invention are not subject to any particular restrictions. Therefore, it is generally possible to use any possible quantum material. In particular, semiconductor nanoparticles with rectangular, circular, elliptical, or tapered geometry that can be in a core/shell configuration or a core/multi-shell configuration are suitable. Semiconductor nanoparticles of this type are known, for example, from WO 2005075339, WO 2006134599, EP 2 528 989 B1 and US 8,062,421 B2, the disclosures of which are incorporated herein by reference.

The quantum material is preferably composed of Group II-VI, Group III-V, Group IV-VI or Group I-III-VI ₂ semiconductors or any desired combination thereof. For example, the quantum material can be selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, GaAs, GaP, GaAs, GaSb, GaN, HgS, HgSe, HgTe, InAs, InP, InSb, AlAs, AlP, AlSb, Cu ₂ S, Cu ₂ Se, CuGaS ₂ , CuGaSe ₂ , CuInS ₂ , CuInSe ₂ , Cu ₂ InGaS ₄ , AgInS ₂ , AgInSe ₂ , Cu ₂ ZnSnS ₄ , alloys and mixtures thereof.

The quantum material can also be in the form of semiconductor nanoparticles on the surface of the non-activated crystalline material. In this type of material, one or more types of semiconductor nanoparticles are located on the surface of one or more types of non-activated crystalline materials (such as non-activated phosphor matrix materials). Such materials are also known as quantum material on the phosphor matrix (QMOP) and are known from WO 2017/041875 A1, the disclosure of which is incorporated herein by reference.

The phosphor or phosphor combination according to the present invention may be in the form of bulk material, powder material, thick or thin layer material or self-supporting material, preferably in the form of a film. It can be further embedded in the packaging material.

The phosphor or phosphor combination according to the present invention can be dispersed in the packaging material, or in the case of suitable size ratio, directly disposed on the primary light source or disposed from its remote end depending on the application (the latter configuration also includes " Remote phosphor technology"). The advantages of remote phosphor technology are known to those familiar with the technology, and are disclosed by, for example, the following publication: Japanese Journal of Applied Physics, Volume 44, Issue 21 (2005), L649-L651.

The term "encapsulation material" refers to the light-transmitting matrix material surrounding the compound and radiation conversion mixture according to the present invention. The light-transmitting matrix material can be formed of polysiloxane, polymer (which is formed from liquid or semi-solid precursor materials, such as monomers or oligomers), epoxy, glass, or a mixture containing polysiloxane and epoxy . Specific but non-limiting examples of polymers include fluorinated polymers, polyacrylamide polymers, polyacrylic acid polymers, polyacrylonitrile polymers, polyaniline polymers, polybenzophenone polymers, poly(methyl) (Methyl acrylate) polymer, polysiloxane polymer, aluminum polymer, polybisphenol polymer, polybutadiene polymer, polydimethylsiloxane polymer, polyethylene polymer, polyisobutylene polymer, Polypropylene polymer, polystyrene polymer, polyvinyl polymer, polyvinyl butyral polymer or perfluorocyclobutyl polymer. The silicone may include gels such as Dow Corning® OE-6450; elastomers such as Dow Corning® OE-6520, Dow Corning® OE-6550, Dow Corning® OE-6630; and resins such as Dow Corning® OE-6450 6635, Dow Corning® OE-6665, Nusil LS-6143 and other products from Nusil, Momentive RTV615, Momentive RTV656 and many other products from other manufacturers. In addition, the packaging material can be (poly)silazane, such as modified organic polysilazane (MOPS) or perhydropolysilazane (PHPS). Based on the packaging material, the proportion of the compound or the radiation conversion mixture according to the present invention is preferably in the range of 1 to 300% by weight, more preferably in the range of 3 to 50% by weight.

In another embodiment, the optical coupling between the luminescent material and the primary light source is preferably achieved by light guide configuration. This makes it possible for the primary light source to be installed at a central location and optically coupled to the luminescent material by means of light guide means (such as optical fibers). In this way, it is possible to place the strong primary light source at a location that is conducive to electrical installation, and at any desired location without the need for other cable routing, but instead only install light-emitting materials by arranging optical waveguides Lamp, the luminescent materials are optically coupled to the optical waveguide.

In addition, the phosphor according to the invention or the radiation conversion mixture according to the invention can be used in filament LEDs, as described in, for example, US 2014/0369036 A1.

The present invention further relates to a lighting unit particularly used for backlighting of display devices, characterized in that it contains at least one light source according to the present invention, and relates to a display device with backlighting, especially liquid crystal display devices (LC displays) It is characterized in that it contains at least one lighting unit according to the invention.

The average particle size of the phosphor according to the present invention used in the LED is usually between 50 nm and 100 µm, preferably between 0.1 µm and 25 µm, and more preferably between 1 µm and 20 µm. The average particle size is preferably determined in accordance with ISO 13320:2009 ("particle size analysis-laser diffraction method"). The ISO standard is based on measuring the particle size distribution by analyzing the light scattering characteristics of the particles. The average particle size can also be determined by means of a suitable Multisizer (such as Beckman Coulter Multisizer 3).

For use in LEDs, phosphors can also be converted into any desired external shape, such as spherical particles, flakes and structured materials and ceramics. For the purposes of the present invention, these shapes are summarized under the term "formed body". The molded body is preferably a "phosphor". Therefore, the present invention additionally relates to a shaped body comprising the phosphor according to the present invention. The production and use of the corresponding formed body are familiar to those familiar with this technology from a large number of publications.

In addition, the phosphor according to the present invention may also be in the form of a phosphor/polymer composite. Suitable polymers for the preparation of phosphor/polymer composites are the encapsulating materials mentioned above.

The compound according to the present invention has the following advantageous characteristics: 1) The compound according to the present invention has an emission spectrum with high blue content and it has a high photoluminescence quantum yield. 2) The compounds according to the invention have low heat quenching. Thus, the compounds according to the present invention TQ _1/2 value is usually in the range of 900 K of the above. 3) The high temperature stability of the compound according to the present invention also enables the material to be used in light sources with high thermal load. 4) In addition, the compound according to the present invention distinguishes and promotes high color reproduction and high color temperature stability in LEDs by long service life. This makes it possible to achieve white-emitting pc-LEDs with high color rendering index. 5) The compounds according to the present invention can be efficiently and inexpensively prepared via simple synthesis.

All the embodiments described herein can be combined with each other, as long as the corresponding embodiments are not mutually exclusive. In particular, based on the teachings of this specification, as a part of conventional optimization, it is an obvious operation to precisely combine the various embodiments described herein to obtain specific and particularly preferred embodiments.

The following examples are intended to illustrate the invention, and in particular to show the results of such exemplary combinations of the described embodiments of the invention. However, it should never be regarded as restrictive, but instead is intended to induce induction. All compounds or components that can be used in the preparation are known and commercially available or can be synthesized using known methods. The temperature indicated in the example is always in °C. In addition, it goes without saying that in both the embodiment and the examples, the amounts of the components used in the composition always total 100%. Percentage data should always be considered in the given context.

Example measurement method Rigaku Miniflex II was used to record the X-ray diffraction pattern, and the Bragg-Brentano geometry was operated in a step of 1 s integration time 0.02° with Cu-K _α radiation.

The reflectance spectrum was measured using a fluorescence spectrometer of Edinburgh Instruments Ltd. For this purpose, the sample is placed in a Ulbricht sphere coated with BaSO ₄ and measured in a simultaneous scan (emission and excitation monochromator parallel). The reflectance spectrum was recorded in the range of 250 to 800 nm. The white standard used is BaSO ₄ (Alfa Aesar 99.998%). The 450 W high-voltage Xe lamp serves as the excitation source.

The emission spectra were recorded using an Edinburgh Instruments Ltd. fluorescence spectrometer equipped with mirror optics for powder samples at an excitation wavelength of 350 nm. The excitation source used was a 450 W Xe lamp. For the measurement of the temperature dependence of emission, the spectrometer is equipped with an Oxford Instruments cryostat (Microstat N2). The coolant used is nitrogen.

An Edinburgh Instruments Ltd. fluorescence spectrometer equipped with mirror optics for powder samples was used to record the excitation spectrum at an excitation wavelength of 450 nm. The excitation source used was a 450 W Xe lamp.

The color coordinates of the CIE 1931 color map are calculated according to DIN 5033-3 (replaced by DIN EN ISO 11664-3).

Example 1 : Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ (0.5% Eu ²⁺ ) In order to synthesize 2.2360 g (2.5000 mmol), 0.4152 g (3.9178 mmol) Na ₂ CO ₃ , 0.3464 g (1.5000 mmol) ) Rb ₂ CO ₃ , 1.6961 g (3.4925 mmol) 4∙MgCO ₃ ∙Mg (OH) ₂ ∙5 H ₂ O, 1.7254 g (15.0000 mmol) (NH ₄ )H ₂ PO ₄ , 0.0066 g (0.0188 mmol) Eu ₂ O ₃ and 0.0014 g (0.0188 mmol) Li ₂ CO ₃ in hexane were combined with each other in an agate mortar to dryness. The powder was then transferred to a beaker and treated in an ultrasonic bath for 15 minutes. The mixture was then wet-milled again to dryness in an agate mortar. The starting material mixture was then calcined at 900° C. for 12 h under forming gas (10% H ₂ , 90% N ₂ ). The obtained pigment cake was then ground into powder in an agate mortar to obtain the title compound. Figure 2 shows the x-ray diffraction pattern of the obtained compound. The relevant reflection, emission and excitation spectra are shown in Figure 3, Figure 4 and Figure 5, respectively. Figure 6 shows details from the CIE 1931 color chart with the color point of Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ . Figure 7 shows the relative process of emission integration with temperature.

Example 2 : Na _2.4 Eu _0.3 KMg ₇ (PO ₄ ) ₆ (10% Eu ²⁺ ) In order to synthesize 13.2 g (15.000 mmol), 1.9078 g (18 mmol) Na ₂ CO ₃ , 1.1402 g (8.25000 mmol) K ₂ CO ₃ , 10.014 g (45.000 mmol) Mg ₂ P ₂ O ₇ , 0.87 g (15.000 mmol) Mg(OH) ₂ and 0.7918 g (0.2249 mmol) Eu ₂ O ₃ were combined with each other in an agate mortar. The starting material mixture was then calcined at 950°C for 6 h under forming gas (70% H ₂ , 30% N ₂ ). The obtained pigment cake was then ground into powder in an agate mortar to obtain the title compound.

Example 3 : Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (AsO ₄ ) ₆ (0.5% Eu ²⁺ ) In order to synthesize 2.2360 g (2.500 mmol), 0.4152 g (3.9178 mmol) Na ₂ CO ₃ , 0.3464 g (1.5000 mmol) ) Rb ₂ CO ₃ , 1.6961 g (3.4925 mmol) 4∙MgCO ₃ ∙Mg(OH) ₂ ∙5 H ₂ O, 2.3846 g (15.0000 mmol) (NH ₄ )H ₂ AsO ₄ , 0.0066 g (0.0188 mmol) Eu ₂ O ₃ and 0.0014 g (0.0188 mmol) Li ₂ CO ₃ in hexane were combined with each other in an agate mortar to dryness. The powder was then transferred to a beaker and treated in an ultrasonic bath for 15 minutes. The mixture was then wet-milled again to dryness in an agate mortar. The starting material mixture was then calcined at 900° C. for 12 h under forming gas (10% H ₂ , 90% N ₂ ). The obtained pigment cake was then ground into powder in an agate mortar to obtain the title compound.

Example 4 : Na _2.7 Eu _0.3 RbMg _6.7 Li _0.3 (AsO ₄ ) ₆ (10% Eu ²⁺ ) In order to synthesize 2.2360 g (2.5000 mmol), 0.3756 g (3.5438 mmol) Na ₂ CO ₃ , 0.3464 g (1.5000 mmol) ) Rb ₂ CO ₃ , 1.6269 g (3.3500 mmol) 4∙MgCO ₃ ∙Mg(OH) ₂ ∙5 H ₂ O, 2.3846 g (15.0000 mmol) (NH ₄ )H ₂ AsO ₄ , 0.1320 g (0.3750 mmol) Eu ₂ O ₃ and 0.0277 g (0.3750 mmol) Li ₂ CO ₃ in hexane were combined with each other in an agate mortar to dryness. The powder was then transferred to a beaker and treated in an ultrasonic bath for 15 minutes. The mixture was then wet-milled again to dryness in an agate mortar. The starting material mixture was then calcined at 900° C. for 12 h under forming gas (10% H ₂ , 90% N ₂ ). The obtained pigment cake was then ground into powder in an agate mortar to obtain the title compound.

Example 5 : Used in a 6500 K white LED : 0.46 g of Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ (0.5% Eu ²⁺ ) from Example 1 and 0.02 g Ba ₂ MgSi ₂ O ₇ : Eu and 0.005 g (Sr, Ca) AlSiN 3: Eu mixed and subsequently dispersed in Dow Corning HF OE6370 poly silicon oxygen. The dispersion was introduced into an LED chip board package with 395 nm LED chips and then cured at 150°C for one hour.

Example 6 : Used in a 2800 K white LED : 0.72 g of Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ (0.5% Eu ²⁺ ) from Example 1 and 0.12 g Lu ₃ Al ₅ O ₁₂ : Ce And 0.09 g of (Ba,Sr) ₂ Si ₅ N ₈ :Eu were mixed, and then dispersed in Silbione RT Gel 4317 A/Silbione RT Gel 4317 B two-component silicone from Bluestar Silicons, Germany. The cured silicone is applied to the 370 nm LED chip.

Figure 1 : The efficiency of LEDs and laser diodes varies with the emission wavelength. Here the triangle represents the LED and the square represents the laser diode. Figure 2 : X-ray diffraction pattern of Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ used for Cu-K _α radiation (Example 1). Figure 3 : Reflectance spectrum of Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ relative to BaSO ₄ as the white standard (Example 1). Figure 4 : The emission spectrum of Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ when excited at 350 nm (Example 1). Figure 5 : For the Eu ²⁺ emission band at 450 nm, the excitation spectrum of Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ (Example 1). Figure 6 : _Details from the CIE 1931 color diagram with the color point of Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ (Example 1). Figure 7 : When excited at 350 nm, the relative process of the emission integral of Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) ₆ changes with temperature (Example 1). Figure 8 : The emission spectrum of an LED usage example at a color temperature of 6500 K, where Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) _{6 is} used as the blue component and Ba ₂ MgSi ₂ O ₇ :Eu and (Sr,Ca) AlSiN ₃ :Eu combination (see Example 5). Figure 9 : The emission spectrum of an LED usage example at a color temperature of 2800 K, where Na _2.985 Eu _0.015 RbMg _6.985 Li _0.015 (PO ₄ ) _{6 is} used as the blue component and Lu ₃ Al ₅ O ₁₂ : Ce and (Ba, Sr) ₂ Si ₅ N ₈ : Eu combination (see Example 6).

Claims (15)

A compound of general formula (I): [M ^I ₄ M ^II ₇ (AO ₄ ) ₆ ] _n (I), characterized in that the compound is doped with RE and Li or doped with RE, wherein each of the following is suitable for the used Symbols and indices: M ^I is selected from the group consisting of Na, K, Rb, Cs and a mixture of two or more; M ^II is selected from Mg, Ca, Sr, Ba, Cu, Zn and both Or a group consisting of a mixture of two or more; A is selected from the group consisting of P, As, Sb, Bi, V, Nb, Ta and a mixture of two or more; RE is selected from the group consisting of Eu, Yb, Sm , Mn and its two or more mixtures; 0 ＜ n ≤ 4. Such as the compound of claim 1, which is represented by the general formula (II): [M ^Ia ₃ M ^Ib M ^II ₇ (AO ₄ ) ₆ ] _n (II), where: M ^Ia is selected from Na, K, Rb and Cs The group of composition; M ^Ib is selected from the group consisting of Na, K, Rb, Cs, and a mixture of two or more of them. Such as the compound of claim 1, which is represented by the general formula (Ia) or (Ib): [M ^I _4-x M ^II _7-x (AO ₄ ) ₆ :RE _x ,Li _x ] _n (Ia) [M ^I _4-2x M ^II ₇ (AO ₄ ) ₆ : RE _x ] _n (Ib), where: 0 <x ≤ 1. Such as the compound of claim 2, which is represented by the general formula (IIa) or (IIb): [M ^Ia _3-y M ^Ib _1-z M ^II _7-x (AO ₄ ) ₆ : RE _x ,Li _x ] _n ( IIa) [M ^Ia _3-2y M ^Ib _1-2z M ^II ₇ (AO ₄ ) ₆ :RE _x ] _n (IIb), where: 0 ≤ y ≤ 1; 0 ≤ z ≤ 1; y + z = x; And 0 <x ≤ 1. Such as the compound of any one of claims 1 to 4, wherein M ^II is Mg, which may be partially replaced by Ca, Sr and/or Ba; and A is P, which may be partially replaced by As, Sb, V, Nb and/ Or Ta replacement. The compound according to any one of claims 1 to 5, wherein the following compounds are suitable for x: 0 <x <1, preferably 0.0 <x ≤ 0.5, more preferably 0.001 ≤ x ≤ 0.1 and particularly preferably 0.001 ≤ x ≤ 0.04 . The compound according to any one of claims 1 to 6, wherein the compound is coated on the surface together with another compound. A method for preparing a compound according to any one of claims 1 to 7, which comprises the steps of: a) preparing a mixture containing M ^I , M ^II , AO ₄ , RE and Li; and b) calcining the prepared mixture. A use of the compound according to any one of claims 1 to 7, which is used as a phosphor or conversion phosphor for partially or completely converting UV light and/or violet light into light having a longer wavelength. A radiation conversion mixture comprising the compound according to any one of claims 1 to 7. The radiation conversion mixture of claim 10, which further comprises one or more other luminescent materials selected from conversion phosphors and semiconductor nanoparticles. A light source comprising at least one primary light source and at least one compound according to any one of claims 1 to 7 or a radiation conversion mixture according to claim 10 or 11. Such as the light source of claim 12, wherein the primary light source comprises luminescent indium aluminum gallium nitride. Such as the light source of claim 13, wherein the luminescent indium aluminum gallium nitride is a compound of formula In _i Ga _j Al _k N, where 0 ≤ i, 0 ≤ j, 0 ≤ k, and i + j + k = 1. A lighting unit containing at least one light source as claimed in any one of claims 12 to 14.

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