TW201341503A - Phosphor material, phosphor composition containing the same, and light emitting device made by the same - Google Patents

Abstract

This invention provides a phosphor material applied in light emitting devices, which is represented as the following formula: (M1-nXn)2SixLyO2N5; wherein M is selected from alkaline earth metal elements; X is selected from rare earth elements or transition metal elements; L comprises Al, B, the combination thereof; 2.4 ≤ x ≤ 3; 0.8 ≤ y ≤ 1.6; and 0.0001 ≤ n ≤ 0.9. The phosphor material of the present invention has the advantage of capability to be excited by ultraviolet light source and blue light source, and thereby a more superior option is provided for the industry concerned.

Description

Fluorescent material, fluorescent material composition containing same, and light-emitting device made therefrom

The present invention relates to a fluorescent material applied to a light-emitting device; and more particularly to an oxynitride fluorescent material applied to a light-emitting device.

With the improvement of luminous efficiency, light-emitting diodes (LEDs) with the dual advantages of "energy saving" and "environmental protection" are regarded as revolutionary light sources to replace hot lamps and fluorescent lamps. Fluorescent materials are indispensable optical conversion materials for single-chip white LEDs. Their advantages and disadvantages will be related to the luminous efficiency, stability, color rendering, color temperature and service life of LEDs. It can be said that R&D and production of single-chip white LEDs The most critical material.

In order to produce white LEDs, the strategy of blue LEDs with YAG phosphors is widely used in the industry. However, the white light obtained by this strategy has the disadvantage of poor color rendering. Therefore, the use of ultraviolet LEDs with R, G, and B fluorescent materials to obtain higher color rendering white light has received much attention in recent years. At the same time, nitrogen oxide and nitride fluorescent materials have gradually become the mainstream of developing new fluorescent materials due to their high chemical stability and thermal stability.

EP1413618 (2004) first revealed NOx oxide phosphors of MSi ₂ N ₂ O ₂ :Eu ²⁺ (M=Ca, Sr, Ba); Li et al. published MSi ₂ N ₂ O ₂ :Eu ² in 2006. ⁺ (M = Ca, Sr, Ba) [Chem. Mater., 17, 3242 (2005)] and MSi ₂ N ₂ O ₂ : Ce ³⁺ (M = Ca, Sr, Ba) [J. Mater. Chem. , 15,4492 (2005)] novel oxyfluoride fluorescent material; Bachmann published a novel red fluorescent material SrSi ₂ N ₂ O ₂ :Yb ^{2+ in} 2006 [J. Lumin. 121, 441 (2006)].

In summary, NOx fluorescent materials are currently the mainstream of LED research. Although there are many kinds of NOx fluorescent materials in the industry, this field is still in the development stage, and it is necessary to develop more diverse nitrogen oxides. Fluorescent materials to provide more choices for the industry.

Accordingly, it is an object of the present invention to provide a novel fluorescent material and a light-emitting device therewith which can be efficiently excited by a source of ultraviolet light and blue light to provide a white light emitting diode. A new choice for fluorescent materials.

Another object of the present invention is to provide a novel fluorescent material for white light emitting diodes, which can achieve white light with high color rendering with appropriate fluorescent materials.

In order to achieve the above object, the present invention provides a fluorescent material applied to a light-emitting device having the following chemical formula: (M _1-n X _n ) ₂ Si _x L _y O ₂ N ₅ , wherein the M system is selected from the group consisting of alkaline earth elements X is selected from the group consisting of rare earth metal elements or transition metal elements; L contains aluminum, boron or a combination thereof; 2.4 ≦ x ≦ 3; 0.8 ≦ y ≦ 1.6; and 0.0001 ≦ n ≦ 0.9.

Preferably, the aforementioned M comprises magnesium, zinc, calcium, strontium, barium or a combination thereof.

Preferably, the aforementioned X comprises ruthenium, rhodium, osmium, manganese, ruthenium, osmium, iridium, osmium or a combination thereof.

Preferably, the aforementioned y=1.

Preferably, the aforementioned fluorescent material has the following chemical formula: (M _1-n X _n ) ₂ Si _x (Al _1-m B _m )O ₂ N ₅ , wherein 0.01≦m≦0.3, n, x are the same as before Said.

Preferably, the fluorescent material is (Ca _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Sr _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Ba _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si _2.8 Al _1.2 O ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si _2.6 Al _1.4 O ₂ N ₅ , (Ca _1-n Eu _{n 2} Si _2.4 Al _1.6 O ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si ₃ (Al _0.9 B _0.1 )O ₂ N ₅ , ( Ca _1-n Eu _n ) ₂ Si ₃ (Al _0.8 B _0.2 )O ₂ N ₅ , or a combination thereof.

The present invention further provides a fluorescent material composition for use in a white light device, comprising: (a) a fluorescent material as described above having the following chemical formula: (M _1-n X _n ) ₂ Si _x L _y O ₂ N ₅ and 0.8≦y≦1.2; and (b) another fluorescent material; wherein the fluorescent material of the above (b) is combined with the fluorescent material of the above (a), and is combined with a suitable excitation source to form white light; b) The fluorescent material is a yellow fluorescent material, a green fluorescent material, a red fluorescent material, or a combination thereof.

Preferably, the yellow fluorescent material is: Y ₃ Al ₅ O ₁₂ :Ce ³⁺ (YAG), Tb ₃ Al ₅ O ₁₂ :Ce ³⁺ (TAG), (Mg, Ca, Sr, Ba) ₂ SiO ₄ : Eu ²⁺ , Alpha-SiAlON, or a combination thereof.

Preferably, the green fluorescent material is BaMg ₂ Al ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ , SrGa ₂ S ₄ :Eu ²⁺ , (Ca,Sr,Ba)Al ₂ O ₄ :Eu ^{2 +} , Mn ²⁺ , (Ca, Sr, Ba) ₄ Al ₁₄ O ₂₅ :Eu ²⁺ , Ca ₈ Mg(SiO ₄ ) ₄ Cl ₂ :Eu ²⁺ , Mn ²⁺ , or a combination thereof.

Preferably, the red fluorescent material is (Sr, Ca)S:Eu ²⁺ , (Y, La, Gd, Lu) ₂ O ₃ :Eu ³⁺ , Bi ³⁺ , (Y, La, Gd ,Lu) ₂ O ₂ S:Eu ³⁺ ,Bi ³⁺ ,(Ca,Sr) ₂ Si ₅ N ₈ :Eu ²⁺ , (Ca,Sr)AlSiN3:Eu ²⁺ , ZnCdS:Ag ⁺ Cl ^- , or Its combination.

The invention further provides a light emitting device comprising: an excitation light source; and a fluorescent material.

Preferably, the light emitting device further comprises a yellow fluorescent material, a green fluorescent material, a red fluorescent material, or a combination thereof.

Preferably, the excitation light source is a light emitting diode, a laser diode, or a combination thereof.

Preferably, the light emitting diode system is an ultraviolet light emitting diode or a blue light emitting diode.

In summary, the present invention provides a novel fluorescent material, a fluorescent material composition containing the same, and a light-emitting device produced using the fluorescent material. The phosphor material of the present invention has the advantage of being excited by the ultraviolet light LED light source and the blue LED light source, and provides a more advantageous choice in the industry.

The present invention relates to a novel oxynitride phosphor material that is advantageous in that it can be excited by an ultraviolet LED source and a blue LED source. Nitrogen oxide fluorescent materials are currently the mainstream of new fluorescent materials developed in recent years, and include a host material which is an oxynitride of an alkaline earth metal element; and an activator.

The fluorescent material of the present invention has the following general formula: (M _1-n X _n ) ₂ Si _x L _y O ₂ N ₅ , wherein M is selected from alkaline earth metal elements; X is selected from rare earth metal elements or transition metal elements L contains aluminum, boron or a combination thereof; 2.4 ≦ x ≦ 3; 0.8 ≦ y ≦ 1.6; and 0.0001 ≦ n ≦ 0.9. In the preparation, for example, yttrium oxide and/or tantalum nitride may be used to provide the desired lanthanum element; for example, aluminum oxide and/or aluminum nitride may be used to provide the desired aluminum element; for example, boric acid and/or boron oxide may be used. To provide the required boron element.

Preferably, the activator is selected from the group consisting of rare earth metal elements such as europium (Eu ²⁺ ), cerium (Ce ³⁺ ), yttrium (Yb ²⁺ ), yttrium (Ga ³⁺ ), yttrium (Tb ³⁺ ),鐠 (Pr ³⁺ ); or transition elements such as manganese (Mn ²⁺ , Mn ⁴⁺ ), 锑 (Sb ³⁺ ); more preferably, 铕 (Eu ²⁺ ) with broadband excitation/discharge band Or 铈 (Ce ³⁺ ). In the preparation, for example, cerium chloride and/or antimony trioxide may be used to provide the desired cerium element; for example, cerium chloride, cerium oxide and/or cerium nitrate may be used to provide the desired cerium element.

The foregoing alkaline earth metal elements include, but are not limited to, magnesium, zinc, calcium, strontium, barium or combinations thereof. In the preparation, for example, magnesium carbonate and/or magnesium oxide may be used to provide the desired magnesium element; for example, zinc oxide may be used to provide the desired zinc element; for example, calcium carbonate and/or calcium oxide may be used to provide the desired Calcium; can be used, for example, with cerium carbonate and/or cerium oxide to provide the desired cerium element; for example, cerium carbonate and/or cerium oxide can be used to provide the desired cerium element.

In one embodiment of the invention, the aforementioned fluorescent material has the general formula: (M _1-n X _n ) ₂ Si _x (Al _1-m B _m )O ₂ N ₅ , wherein the M system is selected from the group consisting of alkaline earth metals Element; X is selected from the group consisting of rare earth metal elements or transition metal elements; 2.4 ≦ x ≦ 3; 0.01 ≦ m ≦ 0.3; and 0.0001 ≦ n ≦ 0.9.

The phosphor material of the present invention may be mixed with another phosphor material to produce a phosphor material mixture; more specifically, the phosphor material of the present invention is combined with the other phosphor material in combination with a suitable excitation source. Forming white light. In one embodiment of the present invention, the fluorescent material has the following general formula: (M _1-n X _n ) ₂ Si _x L _y O ₂ N ₅ , wherein M is selected from alkaline earth metal elements; and X is selected from the group consisting of a rare earth metal element or a transition metal element; L comprises aluminum, boron or a combination thereof; 2.4 ≦ x ≦ 3; 0.8 ≦ y ≦ 1.2; and 0.0001 ≦ n ≦ 0.9. In this embodiment, the fluorescent material may be mixed with another yellow fluorescent material, a green fluorescent material, a red fluorescent material, or a combination thereof to form a white fluorescent material composition. Preferably, the aforementioned fluorescent material of the present invention is combined with a yellow fluorescent material, a green fluorescent material, and a red fluorescent material to provide high color rendering white light.

The yellow fluorescent material includes, but is not limited to, Y ₃ Al ₅ O ₁₂ :Ce ³⁺ (YAG), Tb ₃ Al ₅ O ₁₂ :Ce ³⁺ (TAG), (Mg, Ca, Sr, Ba) ₂ SiO ₄ :Eu ²⁺ , Alpha-SiAlON, or a combination thereof.

The aforementioned green fluorescent material includes, but is not limited to, BaMg ₂ Al ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ , SrGa ₂ S ₄ :Eu ²⁺ , (Ca,Sr,Ba)Al ₂ O ₄ :Eu ^{2 +} , Mn ²⁺ , (Ca, Sr, Ba) ₄ Al ₁₄ O ₂₅ :Eu ²⁺ , Ca ₈ Mg(SiO ₄ ) ₄ Cl ₂ :Eu ²⁺ , Mn ²⁺ , or a combination thereof.

The aforementioned red fluorescent materials include, but are not limited to: (Sr, Ca) SEu ²⁺ , (Y, La, Gd, Lu) ₂ O ₃ : Eu ³⁺ , Bi ³⁺ , (Y, La, Gd, Lu ₂ O ₂ S:Eu ³⁺ ,Bi ³⁺ , (Ca,Sr) ₂ Si ₅ N ₈ :Eu ²⁺ , (Ca,Sr)AlSiN ₃ :Eu ²⁺ , ZnCdS:Ag ⁺ Cl ⁻ , or combination.

In some embodiments of the present invention, the fluorescent material is: (Ca _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Sr _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , ( Ba _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si _2.8 Al _1.2 O ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si _2.6 Al _1.4 O ₂ N ₅ (Ca _1-n Eu _n ) ₂ Si _2.4 Al _1.6 O ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si ₃ (Al _0.9 B _0.1 ) O ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si ₃ (Al _0.8 B _0.2 )O ₂ N ₅ , or a combination thereof.

The preparation method of the fluorescent material of the present invention takes (Ca _0.99 Eu _0.01 ) ₂ Si ₃ AlO ₂ N ₅ as an example, and uses calcium carbonate, cerium oxide, cerium nitride, aluminum nitride and antimony trioxide as raw materials. To provide the required elements. After calculating the required weight of each raw material by stoichiometry, all the raw materials were mixed and ground to obtain a mixture having an average particle diameter of 0.1 μm to 30 μm. The mixture was calcined in a reducing atmosphere (nitrogen and hydrogen) for 6 to 10 hours. Thereafter, the powder obtained by the calcination described above is washed with a suitable solvent (for example, water or dilute hydrochloric acid). After the filtration and drying procedures, the fluorescent material of the present invention is obtained.

The method of grinding described above is not limited, and the above raw materials may be ground in a manner known in the art to obtain the desired average particle diameter of the present invention. The foregoing calcination may use a heating furnace conventionally used in the field, for example, a tubular furnace, a small-sized furnace, a high-frequency furnace, a metal furnace, and the like. The calcination temperature is not particularly limited. The calcination is preferably carried out at a temperature of from 1300 to 1400 °C. Preferably, the foregoing mixture is placed in a crucible made of boron nitride or alumina, and the foregoing mixture is placed in the aforementioned heating furnace together with the crucible to carry out the calcination step. Preferably, in order to improve the crystallinity and luminescent properties of the fluorescent material, a flux may be additionally added to the fluorescent material of the present invention; the fluxing agents include, but are not limited to, NH ₄ Cl, CaF ₂ , SrF ₂ , BaF ₂ , or a combination thereof.

The light-emitting device of the present invention comprises the fluorescent material of the present invention. A typical illuminating device comprises an excitation light source and a phosphor; wherein the fluorescent system is fixed to the surface of the excitation light source. The phosphor includes the fluorescent material of the present invention, and optionally a yellow fluorescent material, a red fluorescent material, a green fluorescent material, or a combination thereof. The phosphor may be fixed to the surface of the excitation light source by an adhesive material such as, for example, a transparent resin.

The excitation light source may be a light emitting diode, a laser diode, or a combination thereof; the light emitting diode may be an ultraviolet light emitting diode or a blue light emitting diode. In one embodiment of the invention, the excitation light source includes a substrate, a semiconductor layer formed on the substrate, and positive and negative electrodes formed on the semiconductor layer. The material of the substrate includes, but is not limited to, sapphire, spinel, SiC, Si, ZnO, GaAs, and GaN materials. The semiconductor material contained in the foregoing semiconductor layer includes, but is not limited to, BN, SiC, ZnSe, GaN, InGaN, InAlGaN, AlGaN, BAlGaN, BInAlGaN, or a combination thereof. It is possible that the components of the aforementioned illuminating device are made of materials used in the field, except that the phosphor comprises at least one luminescent material of the invention.

The details of the present invention are set forth in the accompanying drawings, and the description of the embodiments of the present invention.

Example 1: Preparation of the fluorescent material of the present invention.

As mentioned above, the desired magnesium carbonate, zinc oxide, calcium carbonate, barium carbonate, barium carbonate, antimony trioxide, antimony oxide, antimony oxide, antimony nitride, aluminum oxide, aluminum nitride, Raw materials such as boric acid. The desired raw materials are uniformly mixed and ground to obtain a mixture having an average particle diameter of 0.1 μm to 30 μm. The foregoing mixture was placed in a crucible, and the crucible was placed in a heating furnace at 1300 to 1400 ° C, and calcined under a reducing atmosphere (nitrogen gas and hydrogen gas) for 8 hours. The powder obtained after sintering is then washed with water. Finally, after the filtration and drying process, the fluorescent material of the present embodiment is obtained.

The fluorescent materials prepared in this embodiment are as shown in Table 1 below: Table 1: Fluorescent material samples 1~11 of the present invention

In addition, based on the composition of the sample 1, the sample 1-1, the sample 1-2, the sample 1-3, the sample 1-4, the sample 1-5, the sample 1-6, which are doped with different activator concentrations, are designed. Samples 1-7 and 1-8 are listed in Table 2 below:

Table 2: Fluorescent material samples 1-1~1-8 of the present invention

Example 2: Characterization of the fluorescent material prepared in Example 1.

In the present embodiment, photoluminescence of 11 samples prepared in Example 1 was separately tested. The experimental steps of the present embodiment are based on the conventional operation steps in the art. Briefly, the fluorescent material prepared in the first embodiment is placed on the carrier, and after setting an excitation band, the fluorescent material is excited by the light beam. The emission spectrum of the fluorescent material was measured. Next, the excitation spectrum of the fluorescent material can be measured by measuring the position of the strongest radiation peak of the obtained emission spectrum. Thereby, the absorption band of the fluorescent material and the wave pattern of the emitted light can be known.

The first figure shows the photoluminescence spectrum of sample 1 of Example 1. Sample 1 can absorb energy from 250 to 430 nm with an optimum absorption wavelength of 370 nm. In addition, the emission light of the sample 1 is green light mainly composed of 505 nm.

The second graph shows the photoluminescence spectrum of sample 2 of Example 1. Sample 2 can absorb energy at a wavelength of 250 to 450 nm, and the optimum absorption wavelength is 370 nm. In addition, the emission light of the sample 2 is green light mainly composed of 505 nm.

The third panel shows the photoluminescence spectrum of sample 3 of Example 1. Sample 3 can absorb energy at a wavelength of 270-470 nm, and the optimum absorption wavelength is 375 nm. In addition, the emission light of the sample 3 is green light mainly composed of 510 nm.

The fourth graph shows the photoluminescence spectrum of sample 4 of Example 1. Sample 4 can absorb energy at a wavelength of 270-470 nm, and the optimum absorption wavelength is 375 nm. In addition, the emission light of the sample 4 is green light mainly composed of 510 nm.

The fifth graph shows the photoluminescence spectrum of sample 5 of Example 1. Sample 5 can absorb energy at a wavelength of 270 to 470 nm, and the optimum absorption wavelength is 375 nm. In addition, the emission light of the sample 5 is green light mainly composed of 510 nm.

The sixth graph shows the photoluminescence spectrum of sample 6 of Example 1. Sample 6 can absorb energy at a wavelength of 270 to 470 nm, and the optimum absorption wavelength is 370 nm. In addition, the emission light of the sample 6 is green light mainly composed of 510 nm.

The seventh graph shows the photoluminescence spectrum of sample 7 of Example 1. Sample 7 can absorb energy at a wavelength of 250 to 450 nm, and the optimum absorption wavelength is 360 nm. In addition, the emission light of the sample 7 is green light mainly composed of 510 nm.

The eighth image shows the photoluminescence spectrum of the sample 8 of the first embodiment. The sample 8 can absorb the energy of the wavelength of 250 to 450 nm, and the optimum absorption wavelength is 375 nm. In addition, the emission light of the sample 8 is green light mainly composed of 500 nm.

The ninth graph shows the photoluminescence spectrum of the sample 9 of Example 1, and the sample 9 can absorb energy having a wavelength of 250 to 450 nm, and the optimum absorption wavelength is 375 nm. In addition, the emission light of the sample 9 is green light mainly composed of 505 nm.

The tenth graph shows the photoluminescence spectrum of the sample 10 of the first embodiment, and the sample 10 can absorb the energy of the wavelength of 250 to 450 nm, and the optimum absorption wavelength is 375 nm. In addition, the emission light of the sample 10 is green light mainly composed of 505 nm.

The eleventh image shows the photoluminescence spectrum of the sample 11 of the first embodiment. The sample 11 can absorb energy of 250 to 410 nm, and the optimum absorption wavelength is 380 nm. In addition, the emission light of the sample 11 is blue light mainly composed of 478 nm.

Referring again to Figure 12, the emission spectra of Sample 1, Sample 1-1, Sample 1-2, Sample 1-3, Sample 1-4, and Sample 1-5 are shown; Fig. 14 and Fig. 15 show photoluminescence spectra of samples 1-6, 1-7, and 1-8, respectively.

As can be seen from the twelfth figure, the emitted light of sample 1, sample 1-1, sample 1-2, sample 1-3, sample 1-4, and sample 1-5 are all green light of 505 nm.

As can be seen from the thirteenth figure, the samples 1-6 can absorb energy of 300-450 nm, and the optimal absorption wavelength is 400 nm. In addition, the emission light of the sample 1-6 is red light mainly composed of 650 nm.

As can be seen from Figure 14, samples 1-7 can absorb energy from 300 to 525 nm, and the optimal absorption wavelength is 500 nm. In addition, the emission light of the samples 1-7 is red light mainly composed of 675 nm.

As can be seen from the fifteenth figure, samples 1-8 can absorb energy from 3375 to 525 nm, and the optimal absorption wavelength is 500 nm. In addition, the emission light of the samples 1-8 is red light mainly composed of 675 nm.

Further, the CIE chromaticity coordinate maps of the sample 1 and the sample 11 are detected, and the original spectrum of the sampled radiation is measured by a spectrometer, and the chromaticity coordinates are calculated via a software set CIE 1931 XYZ color matching function. From the results shown in Fig. 16, the chromaticity coordinates of sample 1 are close to (0.33, 0.43), which belongs to the green range; the chromaticity coordinates of sample 11 are close to (0.25, 0.31), which belongs to the blue range.

Based on the results obtained above, each of the samples prepared in Example 1 was excited by blue light and ultraviolet light. If you match the appropriate phosphor powder, white light can be formed. Accordingly, the phosphor material of the present invention is particularly suitable for use in light emitting diodes.

The first figure is the photoluminescence spectrum of Sample 1 of Example 1 of the present invention.

The second figure is the photoluminescence spectrum of Sample 2 of Example 1 of the present invention.

The third panel is the photoluminescence spectrum of Sample 3 of Example 1 of the present invention.

The fourth graph is the photoluminescence spectrum of Sample 4 of Example 1 of the present invention.

Figure 5 is a photoluminescence spectrum of Sample 5 of Example 1 of the present invention.

Figure 6 is a photoluminescence spectrum of Sample 6 of Example 1 of the present invention.

The seventh photograph is the photoluminescence spectrum of Sample 7 of Example 1 of the present invention.

The eighth graph is the photoluminescence spectrum of the sample 8 of the first embodiment of the present invention.

The ninth panel is a photoluminescence spectrum of Sample 9 of Example 1 of the present invention.

The tenth graph is the photoluminescence spectrum of the sample 10 of the first embodiment of the present invention.

The eleventh drawing shows the photoluminescence spectrum of the sample 11 of the first embodiment of the present invention.

Fig. 12 is a radiation spectrum of samples 1-1 to 1-5 of Example 1 of the present invention.

Figure 13 is a photoluminescence spectrum of Samples 1-6 of Example 1 of the present invention.

Figure 14 is a photoluminescence spectrum of Samples 1-7 of Example 1 of the present invention.

The fifteenth diagram is a photoluminescence spectrum of Samples 1-8 of Example 1 of the present invention.

Figure 16 is a CIE chromaticity coordinate map of Sample 1 and Sample 11 of Example 1 of the present invention.

Claims (14)

A fluorescent material applied to a light-emitting device having the following chemical formula: (M _1-n X _n ) ₂ Si _x L _y O ₂ N ₅ , wherein M is selected from alkaline earth metal elements; and X is selected from rare earth metal elements Or a transition metal element; L comprises aluminum, boron or a combination thereof; 2.4 ≦ x ≦ 3; 0.8 ≦ y ≦ 1.6; and 0.0001 ≦ n ≦ 0.9. The fluorescent material according to claim 1, wherein the aforementioned M comprises magnesium, zinc, calcium, strontium, barium or a combination thereof. The fluorescent material according to claim 1, wherein the X comprises ruthenium, osmium, iridium, manganese, osmium, iridium, osmium, iridium or a combination thereof. The fluorescent material according to claim 1, wherein the aforementioned y=1. The fluorescent material according to claim 1, which has the following chemical formula: (M _1-n X _n ) ₂ Si _x (Al _1-m B _m )O ₂ N ₅ , wherein 0.01≦m≦0.3 . The fluorescent material according to claim 1, which is (Ca _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Sr _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , ( Ba _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si _2.8 Al _1.2 O ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si _2.6 Al _1.4 O ₂ N ₅ (Ca _1-n Eu _n ) ₂ Si _2.4 Al _1.6 O ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si ₃ AlO ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si ₃ (Al _0.9 B _0.1 ) O ₂ N ₅ , (Ca _1-n Eu _n ) ₂ Si ₃ (Al _0.8 B _0.2 )O ₂ N ₅ , or a combination thereof. A fluorescent material composition for use in a white light device, comprising: (a) a fluorescent material according to claim 1, which has the following chemical formula: (M _1-n X _n ) ₂ Si _x L _y O ₂ N ₅ and 0.8 ≦ y ≦ 1.2; and (b) another fluorescent material; wherein the fluorescent material of the above (b) is combined with the fluorescent material of the above (a), and is combined with an appropriate excitation source to form white light. The fluorescent material of the above (b) is a yellow fluorescent material, a green fluorescent material, a red fluorescent material, or a combination thereof. The fluorescent material composition according to claim 7, wherein the yellow fluorescent material is: Y ₃ Al ₅ O ₁₂ :Ce ³⁺ (YAG), Tb ₃ Al ₅ O ₁₂ :Ce ³⁺ (TAG ), (Mg, Ca, Sr, Ba) ₂ SiO ₄ :Eu ²⁺ , Alpha-SiAlON, or a combination thereof. The fluorescent material composition according to claim 7, wherein the green fluorescent material is BaMg ₂ Al ₁₀ O ₁₇ :Eu ²⁺ , Mn ²⁺ , SrGa ₂ S ₄ :Eu ²⁺ , ( Ca,Sr,Ba)Al ₂ O ₄ :Eu ²⁺ ,Mn ²⁺ ,(Ca,Sr,Ba) ₄ Al ₁₄ O ₂₅ :Eu ²⁺ ,Ca ₈ Mg(SiO ₄ ) ₄ Cl ₂ :Eu ²⁺ , Mn ²⁺ , or a combination thereof. The fluorescent material composition according to claim 7, wherein the red fluorescent material is (Sr, Ca)SEu ²⁺ , (Y, La, Gd, Lu) ₂ O ₃ :Eu ³⁺ , Bi ³⁺ , (Y, La, Gd, Lu) ₂ O ₂ S: Eu ³⁺ , Bi ³⁺ , (Ca, Sr) ₂ Si ₅ N ₈ : Eu ²⁺ , (Ca, Sr) AlSiN ₃ : Eu ²⁺ , ZnCdS: Ag ⁺ Cl ^- , or a combination thereof. A light-emitting device comprising: an excitation light source; and a fluorescent material as described in claim 1 of the patent application. The illuminating device of claim 11, further comprising a yellow fluorescent material, a green fluorescent material, a red fluorescent material, or a combination thereof. The illuminating device of claim 11, wherein the excitation light source is a light emitting diode, a laser diode, or a combination thereof. The light-emitting device of claim 11, wherein the excitation light source is an ultraviolet light-emitting diode or a blue light-emitting diode.