TWI379884B - - Google Patents

Description

IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a fluorescent main illuminant material, and further, X relates to a high luminous efficiency, long-life organic electric power using the aforementioned fluorescent main illuminant material. Excitation light device. [Prior Art] 1 Recently, organic semiconductors and organic conductive materials have been studied enthusiastically, and in particular, organic light-cooling devices using light-emitting elements of organic semiconductors have progressed. Organic electroluminescence (0EL) is a phenomenon in which an organic substance is excited by a corresponding electric energy under a certain electric field. In 1963, p0pei et al. first studied the 10~20"111 thick® (anthracene) single wafer and first found that after applying 4 volts of voltage across the crystal, 'onion can be observed to emit blue fluorescence, so that the organic electricity is excited. The research of light has taken the first step. However, due to the difficulty in growing single crystals and large area, and the required driving voltage is too large, the luminous efficiency is inferior to that of inorganic materials, so it has no practical value. Subsequently, Helfrich and Williams and others continued their efforts to reduce the voltage to about 100 volts, and obtained an external neutron efficiency of about 5% photon/electron 'but because the thickness of the crystal is too large', the driving voltage is also high, resulting in electrical energy conversion. The efficiency of light energy is too low. In 1982, Vincett et al. used a vacuum evaporation method to make a 50 nm thick onion film. Further, when the drive house was lowered to 30 volts, blue fluorescence was observed, but the electron injection efficiency was too low and the onion was formed. The film properties are not good, so its external quantum efficiency is only about 0.03%. After more than 20 years of sporadic development, there have been no major breakthroughs. Until 1987, the Eastman Kodak company

Tang and VanSlyke et al. first published organic light-emitting diodes (organie 1379884 light-emitting diodes, OLEDs), which was a breakthrough development. They used aromatic diamine (HTM-2) as a hole transport layer material, and a good film-forming property of 8_hydroxyquinoline A1q3 (tris(8-hydr〇xyquinolinato)alumimim(III)) as an electron transport layer and luminescence. The material is vacuum-deposited to form a film of 60 to 70 nm, and a low work function magnesium-silver alloy is used as a cathode to improve the injection efficiency of electrons and holes. The organic small molecule luminescent material developed by the two electrodes is placed, and the light is emitted when it is energized, which generates green light with a wavelength of 53 〇nm, which can exhibit low driving voltage and high quantum efficiency (> 1%) ) and the φ effect of component stability, which greatly enhances the characteristics and practicability of organic small molecule electroluminescent devices. Then in 1990, 'Cambridge University' Friend et al. subsequently published p〇lymer light-emitting diodes (PLEDs)' to spin-coat the conjugated southern molecule PPV (poly (p-phenylene vinylene)) as a light-emitting layer, a polymer electroluminescent device having an early layer structure, which has a simple process, good polymer properties and semiconductor-like properties, so that a total of polymer light-emitting materials Research in the field has developed rapidly. It is worth noting that compared to the current FPD with LCD as the mainstream, 〇LED Lu not only self-illuminates, does not require a backlight module, and has low driving voltage, high brightness, high contrast, wide viewing angle, fast response, and simple structure. , ultra-thin film, light weight and other advantages can be effectively applied to lighting or made into displays, photocouples, connectors, etc. If fabricated on a flexible substrate such as a plastic substrate, the device can be bent and folded for easy carrying. The process is simple and is expected to significantly reduce costs. At present, more than 80 companies around the world have been attracted to invest heavily in the development of organic electroluminescent display technology, which has become the mainstream of another display technology.乂In 1997, Pioneer of Japan first published a low-molecular monochromatic (green) passive display, which successfully applied organic electroluminescence display technology 1379884, and applied it practically on automotive instrument panels. Since then, organic electroluminescent display has begun to be commercialized and has been applied to small-sized panels, such as the 1998 TDK Corporation, 2002 Sparks Technology, Samsung, NTT Do Co Mo. Color Phone, 2003 Kodak Digital Camera Wait. Sakamoto Pioneer and Kodak Kodak also cooperated with a small amount of LED monochromatic and multi-color (monochrome d multicolor) display, which has been officially applied to Motorola mobile phones, 'very well received; and Sanyo also cooperated with Kodak to make A small-size full-color OLED sample is claimed to be mass-produced in 2001. CMI has also released an active color display of more than 10 inches, making organic electro-optic technology even more advanced. However, until now, OLEDs still have further improvements, including their color saturation, stability, luminous efficiency and longevity. This is closely related to the nature and process of the material itself. If it can break through, it should be expected to become the future. Trends in displays>> Luminescent materials are the most important materials in organic electroluminescent devices. Good luminescent materials must meet four conditions: (1) high quantum efficiency fluorescence characteristics' and the fluorescence spectrum is mainly distributed between 400 and 700. In the visible region of nm; (2) good semiconductor properties, high conductivity, ability to conduct electrons or holes, # or both; P) good film formation, not in tens of nanometers of film Pinholes will be produced; (4) Good thermal stability. Most of the electron transport layer and the hole transport layer can be used as luminescent materials in the visible light region. Since most organic materials exceed a certain concentration, especially in the solid state, there will be self-quenching or concentration. The zero quenching of the concentration quenching results in a broadening of the emission peak or a red shift, so the fluorescent dopant is generally doped in a low concentration manner with certain carrier properties. In the fluorescent main illuminant material (h〇st), it is used as a dopant emitter. Several design considerations for fluorescent primary illuminant materials and fluorescent dopants for organic electroluminescent devices are: (丨) Rong 7 1379884 Light dopants have high fluorescence efficiency; (2) Fluorescence blending The absorption spectrum of the impurity and the emission spectrum of the fluorescent main emitter material should be well overlapped so that the energy can be efficiently transmitted from the host to the guest; (3) there are red, blue, green or yellow emission peaks, and the emission The peak is as narrow as possible to maintain the purity of the light color; (4) the stability is good and can be evaporated. In recent years, the industry has devoted itself to the research of organic electroluminescent materials, and has already achieved good results. Red, blue and green are the three primary colors of light. Good three primary color efficiencies and solid colors are the basic important requirements for achieving full color displays. In the patent publication of Japanese Laid-Open Patent Publication No. 2001-335516, an organic electroluminescent device is disclosed. The structure of the fluorescent main emitter material of the light-emitting layer is as follows:

An organic electroluminescent device is disclosed in U.S. Patent No. US-A-0,050, 897, 017 to Kodak Corporation, the luminescent element of which has a fluorescent luminescent material structure as follows: 8 1379884

Different from the invention of this patent, the photoelectric characteristics are also different. Lovion

The wavelength of the fluorescent wavelength is shorter. = Patent EP 1 655 359 discloses that when used in combination with a hybrid, there may be a % & θ illuminant material when it is blended with fluorescent light. However, this patent requires that the light-emitting efficiency of the photo-dopant and the separation and purification of its isomers have a drawback, that is, the material has a shorter spectral property. u its towel - an isomer

In view of the shortcomings of the prior art, the main illuminant material has high efficiency and industrial application value. The present invention attempts to develop a novel glory long life, which is easy to prepare and easy to commercialize. [Summary of the Invention] The present invention aims to provide a fluorescent host material. Compared with the conventional fluorescent main illuminant material, the present 2 love type? The photo-luminescence material has the advantages of improving the luminous efficiency, lifetime, and ease of synthesis and purification of the fluorescent luminescent dopant. Another object of the present invention is to provide a high luminous efficiency, long life 9 1379884 organic electroluminescent device, the luminescent layer of which comprises the fluorescent main illuminant material of the present invention. In order to achieve the above object, the fluorescent main light-emitting material of the present invention has the structure represented by the following chemical formula (I).

Wherein, Aq represents phenyl (phenyl) or 1-naphthyl (l-naphthyl), and 1 and L2 are each independently 2,6-naphthalenyl, 1,4-naphthyl (l , 4-naphthalenyl), 1,4-phenylene, 1,3-phenylene, 1-naphthyl or 2-naphthyl (2-naphthyl), Αγ2 represents hydrogen or a C6-C20 aromatic ring functional group. In a preferred embodiment, the fluorescent host material of the present invention is a compound of the formula:

10 1379884 (Inv-2) '

11 1379884

(Inv-7). The present invention further provides an organic electroluminescent device comprising a layered structure arranged in the following order: a transparent substrate, an anode layer, a hole transport layer, a light emitting layer, an electron transport layer and a cathode layer; wherein the anode layer and The cathode layer system φ is in contact with an external power source to form an electrical path, and the organic motor light-emitting device is characterized in that the light-emitting layer contains the aforementioned glory main light-emitting material. In a preferred embodiment, the luminescent layer of the organic electroluminescent device of the present invention further comprises a fluorescent dopant, and preferably, the camping dopant is a deep blue fluorescent dopant, in particular It has the characteristics of CIEx' 0.15, CIEyS0.18 in the coordinates of Commission Internationale d' Exclairage (CIEx, y). In a more preferred embodiment, the dark blue fluorescent dopant contained in the light-emitting layer of the organic electroluminescent device of the present invention has the structure shown by the following chemical formula:

f (BD-1). [Embodiment] The fluorescent main illuminant material of the present invention has the following formula (1): 12 1379884 The fluorescent main illuminant material of the present invention has the structure represented by the following chemical formula (1)

Wherein 'Ari stands for phenyl or 1-naphthyl, Li and L2 are each independently 2,6-naphthalenyl, 1,4-naphthyl^1,4-11叩She also 1^1), 1,4-phenylenyl (1,4_1)11 as a form, 1,3_^ U-phenylene '1-naphthyl or 2-naphthyl (2-naphthyl), An represents hydrogen or a C6-C20 aromatic ring functional group. The present invention is a compound of the following formula:

13 1379884

The compound of the present invention having the structure described above has the advantages of improving the luminous efficiency, high lifetime, and ease of synthesis and purification of the fluorescent dopant. The organic electroluminescent device of the present invention comprises a layered structure in the following order: a transparent substrate, an anode layer, a hole transport layer, a light-emitting layer, an electron transport layer and a cathode layer; wherein the anode The layers and the cathode layers are respectively in contact with an external power source to form an electrical path, and the layers other than the light-emitting layer are selected from the ordinary knowledge of the art without limitation. For example, the transparent substrate may be light-transmitting. Inflexible glass substrate with characteristics • Transparent organic polymer material with flexibility; and indium tin oxide (ITO) such as anode layer. The organic electroluminescent device of the present invention is characterized in that the luminescent main layer material is contained in the luminescent layer. In a preferred embodiment, the anode layer and the hole transport layer may further comprise a hole injection layer; the electron transport layer and the cathode layer further comprise an electron injection layer, wherein the hole injection layer and The material of the electron injecting layer is also a common knowledge in the art without limitation.

In the current selection of the luminescent layer material of the organic electroluminescent device, a fluorescent main illuminant material and a fluorescent dopant are usually used to achieve the effect of the south efficiencies. Therefore, in the light-emitting layer of the organic electroluminescent light of the present invention, the fluorescent light-emitting layer can further have a fluorescent dopant, and the light-emitting main light-emitting body of the present invention is limited to lifting red, green or light-colored light-changing materials. Efficacy, but preferably, the fluorescent primary illuminant material of the present invention, together with the blue fluorescent dopant, constitutes a luminescent layer. The blue fluorescent dopant system can be a material of various blue fluorescent dopants known in the art, including, but not, the following chemical formula: A sample L 15 1379884

The following embodiments are intended to further understand the advantages of the present invention and are not intended to limit the scope of the invention. • Example 1 · Fluorescent main luminescence of the invention «Synthesis of material 6 bismuth acid (6-phenvl-nai?hthalene-2-Boronic acid)

A

(2-Bromo-6-phenyl-naphthalene), dissolved in 100 ml of tetrahydrofuran, the reaction temperature was lowered to -78 ° C, and 20 ml of n-butyl lithium was added dropwise. 1 reaction was added for 1 hour. Methyl triethyl borate, reacted back to hydrazine after 1 hour. 25 ml of dilute hydrochloric acid was added to the mixture, and the mixture was stirred for 30 minutes. The organic layer was separated and separated, and the solid was concentrated. The solid was collected by filtration. The solid was washed with n-hexane and dried to yield 5.9 g of the product, yield 64.0%. 9-fan-1-yl-10-(6- phenyl-fan-2-yl)-onion (9-Naphthalen-1 -vl-10-("6-t)henvl-nat)hthalen-2- Synthesis of vjJ-anthrace ne) (Inv-1) 1379884

19.15 g of 9-Bromo-lO-naphthalen-l-yl- anthracene and 14.80 g of 6-phenyl-naphthalene-2-butyric acid were placed under nitrogen ( 6-phenyl-naphthalene-2_Boronic acid), 27.6 potassium carbonate, 35 ml water '200 ml tetrahydroanthracene and 1.5 g of tetrakis(triphenylphosphine), refluxing overnight (20 hours), cooling, adding water to force solids The solid was taken by filtration, dried, and then crystallized and recrystallized. The solid was collected by filtration and dried to obtain 16.4 g of the finished product, and the purity was 99.1% 'yield 65.0%. The purity after sublimation purification was 99.5%. [HPLC conditions] column: rp_8, flow rate: 1.0 ml/min, CH3CN: H20 = 90:10 4 NMR (400 MHz) spectral data: δ 8.05-8.09 (d, 1H), 7.96-8.10 (m, 5H), 7.76-7.91 (m, 3H), 7.60-7.70 (m, 5H), 7.40-7.59 (m, 4H), 7.25-7.35 (m, 6H) 6 - shed acid-[1,2']_bisnaphthyl (6*-Boronic acid-"1.2'lbinaphthalenvn synthesis

Under nitrogen, 16.0 g of 6'-bromo-[1,2,]bisnaphthyl (6'-Bromo-[l,2']binaphthalenyl) was dissolved in 120 ml of tetrahydroanthracene, and the reaction temperature was lowered to -78. C, 22 ml of n-butyl clock (n-butyl 17 1379884 lithium) was added dropwise to the reaction for 1 hour. Add 12 ml of triethyi borate. After 1 hour, return to 〇 ° C, add 30 ml of dilute hydrochloric acid, and stir 30 After a minute, the organic layer was separated and allowed to stand. The concentrated solid was precipitated, and the solid was solidified. The solid was washed with n-hexane to dryness to obtain 8.3 g of the finished product, yield 56.0%. Synthesis of 6'-Π0-stupyl-a-9-based)-Γ1.2Ί镂茬(-Phenvl-anthracen-tvlMUlbinaphthalenvl) (Ιην·2)

Under nitrogen, 16.6 g of 9-bromo-10-phenyl-anthracene (9,Bromo_l〇-phenyl-anthracene) and 17.80 g of 6'- linonic acid-[1,2']bisnaphthyl (6'-B) were placed under nitrogen. 〇ronic acid-[l,2']binaphthalenyl), 27.6 potassium carbonate, 35 ml water, 200 ml tetrahydrofuran and 1.6 g of tetrakis(triphenylphosphine)palladium, refluxed overnight (20 hours), cooled, and added with water to solidify The solid was filtered and dried, and the toluene was recrystallized, and the solid was collected by filtration, and dried to obtain 15.7 g of the finished product, the purity was 99.1%, and the yield was 62.0%. The purity after sublimation purification was 99.7%. [HPLC conditions] Column: RP-8, flow rate: 1. 〇ml/min, CH3CN: 100% 4 NMR (400 MHz) Spectral data: δ 8.26 (d, 1H), 7.86-8.04 (m, 10H), 7.37 -7.78 (m, 11H), 7.23-7.27 (m, 4H) 1379884 4-Sornic acid-6'-phenyl-anthracene, 2Ί譬naphthalene Γ 4-Boronic acid-Si-pheiryl-rU'lbinaDhthalenvn

10.2 g of 4-bromo-6,-phenyl-[1,2']binaphthalenyl) was dissolved under nitrogen, dissolved in 120 ml of four winds. 》α夫味'Reaction temperature dropped to -78 C' 22ml of n-butyl lithium was added dropwise, 12ml of triethyl borate was added for 1 hour, and the reaction was returned to 〇 after 1 hour. . 〇 Add 3 〇ml of dilute hydrochloric acid, stir for 30 minutes, let stand to separate the organic layer, concentrate the solid, and transfer to a solid. The solid is washed with n-hexane and dried to obtain 8.3 g of finished product, the yield is 56.0%. . Synthesis of 6'Mumyl-4-Π0-Momo 茛-9-ylindole (6,-Phenyl-4-n〇-phenyl-anthracen-9-vl)-rK2, lbmaphthalenv 1) (Inv- 3)

Under nitrogen, 16.6 g of 9-bromo-10-phenyl-anthracene and 21.6 g of 4-boronic acid-6,-phenyl-[1,2']bisnaphthyl (4) were placed under nitrogen. -B〇ronic acidW-phenyiqiJ'Jbinaphthalenyl),]?/ Carbonic acid clock, 40 ml water, 250 ml tetrahydrofuran and 1.5 g of tetrakis(triphenylphosphine)palladium, refluxing overnight (20 19 1379884 hours) 'cooling' with water The solid was taken out, the solid was filtered, dried, and the benzene was recrystallized, and the solid was collected by filtration, and dried to obtain 16.3 g of the finished product, the purity was 99.2%, and the yield was 56.0%. The purity after sublimation purification was 99.5%. [HPLC conditions] column: RP-8, flow rate: 1.0 ml/min, CH3CN: 100% 4 NMR (400 MHz) Spectral data: δ 8.33-8.42 (m, 2H), 8.06-8.11 (m, 2H), 7.94 (s, 1H), 7.55-7.79 (m, 7H), 7.43-7.52 (m, 4H), 7.12-7.41 (m, 14H) 4- shed acid-ΓΙ, Ι '1 police naphthyl (4-Boronic acid -ri.ribinaDhthalenvl)

Under nitrogen, 16.5 g of 4_bromo_[〗 〖,]4-bromo-[l,r]binaphthalenyl) was dissolved in i〇〇ml tetrahydrofuran, and the reaction temperature was lowered to -78 ° C. 2 〇ml of n-butyl lithium was added dropwise, and 11 m of triethyl borate was added for 1 hour. After 1 hour of reaction, return to 0 ° C, add 25 mi of dilute hydrochloric acid, and stir for 30 minutes. The organic layer was precipitated in layers and precipitated as a solid, and the solid was solidified. The solid was washed with n-hexane to obtain a finished product of 8 〇 5 g, yield 54.0%. 20 1379884 4-(10-Phenyl-fluorene-9-a certain νπ, ΐΊ蝥naphthalene (4-n〇-Phenvl-anthracen, 9-vn-ri.ribinaphthalenvl) synthesis (Inv-4)

Under nitrogen, 16.6 g of 9-Bromo-10-phenyl-anthracene and 17.9 g of 4-boronic acid _6'-phenyl®-[1,2'] bisnaphthyl group were placed under nitrogen. (4-Boronic Wang. 1 (1-6'-卩11611>4-[1,2']1^11&卩111:11&1611丫1), 27.6 carbonic acid clock, 4〇1111 water, 270 ml tetrahydrofuran And 1.6 g of tetrakis(triphenylphosphine)palladium, refluxing reaction overnight (20 hours), cooling, adding water to extract solids, filtering to take solids, drying, recrystallization of toluene, filtering to obtain solids, drying to obtain 14.7 g of finished product, purity 99.1%, yield 58.0%. Purity after purification by sublimation was 99.7% [HPLC conditions] column: RP-8, flow rate: 1.0 ml/min, CH3CN: H20 = 90:10 φ 4 NMR (400 MHz) Spectral data: δ 8.30-8.39 (m, 2H), 8.28-8.30 (d, 1H), 8.10-8.12 (d, 1H), 7.75-7.78 (d, 1H), 7.60-7.71 (m, 7H), 7.19-7.55 (m ,14H) 4-boronic acid-"1,2'1 double naphthalene (4-Boronic acid_"1.2'lbinat) hthalenvn synthesis

21 1379884 (4-Bromo-[l,2']binaphthalenyl), dissolved in i〇〇mi tetrahydrofuran, the reaction temperature was lowered to -78 ° C, 20 ml of n-butyl lithium was added dropwise, and the reaction was added for 1 hour. 11ml of triethyi borate, after reacting for 1 hour, returning to 0 ° C, adding 25 ml of dilute hydrochloric acid, mixing for 30 minutes, standing to separate the organic layer, separating the solid to precipitate, filtering to obtain a solid, solid with n-hexane (n-hexane) washing, drying to obtain 7.6 g of finished product, yield 51.0% 〇4-(10-phenyl-fluoren-9-yl)-[1,2']bisnaphthyl (4-Π〇-Ρ1 Synthesis of ηγγ1-αιη1ΐΓ&〇6η-9-ν1)-Γ1,2ΊΜϊΊ&ρ1^1ιαΐ6ην1)(Ιην-5)

Under nitrogen, 16.6 g of 9-Bromo-10-phenyl-anthracene and 17.9 g of 4-rotonic acid-[1,2']bisnaphthyl (4-Boronic acid) were placed under nitrogen. -[l,2']binaphthalenyl), 27.6 potassium carbonate, #40 ml water' 270 ml tetrahydroanthracene and 1.6 g of tetrakis(triphenylphosphine), reflux reaction overnight (20 hours), cooling, adding water The solid was collected by filtration, dried, and then recrystallized from toluene. The solid was collected by filtration and dried to yield 17.1 g of the product, purity 99.1%, yield 68.0%. The purity after sublimation purification was 99.5%. [HPLC conditions] column: RP-8, flow rate: 1.0 ml/min, CH3CN: H20 = 90:10 NMR (400 MHz) Spectral data: δ 8·33_8·39 (m, 2H), 7.89-7.92 (d, 2H), 7.79-7.81 (d, 1H), 7.57-7.74 (m, 8H), 7.13-7.50 (m, 13H) 22 1379884 Component life (hr) 00 315 302 OO CN 298 VO ON 1—^ 203 Os OO Power efficiency " 3.03 4.20 4.29 3.51 4.264 3.32 3.52 3.39 Luminous efficiency* 6.55 8.62 8.66 8.50 8.98 7.03 8.56 8.43 1 CIE· (0.15, 0.18) (0.15, 0.18) (0.15, 0.17) (0.15, 0.18) (0.15, 0.17 (0.15, 0.16) (0.15, 0.19) (0.15, 0.19) Electron transport layer (20 nm) Alq3 Alq3 Alq3 Alq3 Alq3 Alq3 Alq3 Alq3 Luminescent layer (25 nm) Fluorescent dopant BD-1 BD-1 BD-1 BD-1 BD-1 BD-1 BD-1 BD-1 Main Luminescent Material ADN Inv-1 Inv-2 Inv-3 Inv-4 Inv-5 Inv-6 Inv-7 Hole Transport Layer (20 nm) NPB NPB NPB NPB NPB NPB NPB NPB hole injection layer (60 nm) CuPC CuPC CuPC CuPC CuPC CuPC CuPC CuPC Comparative Example 1 Example 1 Example 2 1 Example 3 Example 4 Example 5 I Example 6 Example 7 ^痗铖奴回w 3 3 /p 3 Ο Ο 0^^^3⁄4-Drive «KtK Lai ^ί ^#¥^H-ao/v Day OCN·^, 1379884 It can be seen from the above table that the fluorescent main illuminant material of the present invention has the advantages of improving the luminous efficiency and lifetime of the fluorescent dopant, and the ease of synthesizing materials, and has the potential for commercial application. All the features that may be associated with other methods may be selectively replaced by phase=equal or :: purpose features, so, except for the particularly significant 拄ίίί'r Some of the features disclosed in this specification are only one example of equal or similar features. The ft invention has been disclosed above in the preferred embodiment, but it is not intended to be used in the context of the present invention without departing from the spirit of the invention.

28

Claims (1)

/V年'曰曰修(楚) is replacing the tenth, the application for patent gardens ^-101 October η曰 structure: species §7^ illuminant material, the system has the following listening formula (1) L broad I < r-Ar2 wherein, the structure represented by the chemical formula (1), I the following compounds: The organic electroluminescent device is arranged in the following order. a transparent substrate, an anode layer, a hole transport layer, a light-emitting layer, an electron transport layer, and a cathode layer; wherein the gate layer and the cathode layer are respectively in contact with an external power source to form an electrical path, and the organic motor light-emitting device It is characterized by the inclusion of 1379884 ________________ ... in the luminescent layer ("month'/q repair (more) is replacing the page of October 101, containing the fluorescent main illuminant material of the patent application scope item 1. 3. The device of claim 2, wherein the anode layer and the hole transport layer further comprise a hole injection layer. [4] The device of claim 2, wherein the electron The device further comprises an electron injecting layer between the transport layer and the cathode layer. The apparatus of claim 3, wherein the illuminating layer further comprises a glory dopant. The device according to item 5, wherein the fluorescent dopant is characterized by having a characteristic of CIEx^O.15, CIEy^O.18 in the coordinates of the Commission Internationale d'Exclairage (CIEx, y). Light dopant 7. Application of the device according to item 6 patentable scope, wherein the compound represented by the following formula dark blue fluorescent dopant lines: (BD-1). 31