CN116535431A - 一类反Kasha规则的窄谱带蓝紫光TADF材料及其在OLEDs中的应用 - Google Patents
一类反Kasha规则的窄谱带蓝紫光TADF材料及其在OLEDs中的应用 Download PDFInfo
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F5/00—Compounds containing elements of Groups 3 or 13 of the Periodic Table
- C07F5/02—Boron compounds
- C07F5/027—Organoboranes and organoborohydrides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/12—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising dopants
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
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- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6576—Polycyclic condensed heteroaromatic hydrocarbons comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1029—Heterocyclic compounds characterised by ligands containing one nitrogen atom as the heteroatom
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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
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- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1096—Heterocyclic compounds characterised by ligands containing other heteroatoms
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- H10K2101/00—Properties of the organic materials covered by group H10K85/00
- H10K2101/20—Delayed fluorescence emission
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本发明属于发光与显示技术领域,具体公开了一类反Kasha规则的窄谱带蓝紫光TADF材料及其在OLEDs中的应用。这类发光材料由氧桥联三苯基硼‑二咔唑亚苯基‑螺吖啶芴构成,存在(S1→S0和S2→S0)两种辐射跃迁发光行为,可克服传统窄谱带蓝紫光TADF材料的本征矛盾。其溶液加工制备的简单三层OLED在410nm处实现了蓝紫发射,半峰宽仅有33nm,相应色坐标为(0.164,0.045),其最大外量子效率高达9.61%。本发明为解决传统D‑A型TADF材料很难协同实现窄谱带和短波长发射问题提供了新的途径。
Description
技术领域
本发明属于发光与显示照明技术领域,具体涉及一类包含氧桥联三苯基硼-二咔唑亚苯基-螺吖啶芴的有机蓝紫发光材料及其在有机电致发光器件(OLEDs)中的应用。
背景技术
有机发光二极管(OLED)被誉为新一代新型显示技术,已广泛用于小型、中型显示器。与液晶显示器比较,OLED具有更清晰的色彩纯度、更宽的色域、更大的视角和更高的对比度,且不需要任何背光单元,可实现各种轻量化外形,包括可折叠、可滚动和透明显示器,是当今最具发展潜力显示技术。
得益于材料化学、器件物理以及制造技术的可持续发展,OLED的性能、耐用性以及可制造性等都得到了较大的改善,但仍然存在一些紧迫的挑战。2012年,国际电信联盟颁布了Rec.2020色域标准,其中,红(R)、绿(G)、蓝(B)三原色的CIE坐标分别为(0.708,0.292)、(0.170,0.797)、(0.131,0.046)。这为显示色域标准提出了亘古未有的质量要求。发光层是OLED最重要的部分,其材料对OLED的性能(光色、效率、寿命、亮度等)起着决定性的作用,开发出满足Rec.2020色域标准,窄半峰宽(FWHM)的发光材料是解决上述色域问题的关键。
近几年,有机热激活延迟荧光(TADF)材料因能够通过反系间窜越(RISC)过程,有效实现三重态激子向单重态激子的转化,并获得近100%的内部量子效率,已成为最有前途的新型发光材料之一。通常,有机TADF材料是利用D-A构型来减少HOMO/LUMO之间的重叠,从而产生最小的ΔEST。然而,TADF材料存在的分子内电荷转移(ICT)性质容易导致激发态下的结构弛豫,并表现出较大的斯托克斯位移、宽的发射光谱和较大的半峰宽(FWHM)。较大的FWHM容易导致低的色纯度,这不利于有机TADF材料在超高清显示面板中的应用。
与红光和绿光相比,高效的窄谱带蓝紫光TADF发光材料,特别是色坐标y值小于0.05的窄谱带蓝紫光TADF材料,仍面临诸多挑战。主要原因如下:(1)高能主体材料和传输层非常稀少;(2)长寿命三线态激子影响TADF-OLED的稳定性和效率滚降;(3)蓝紫色材料的低RISC过程容易导致激子湮灭;(4)大多数蓝紫色TADF材料表现了宽的电致发光光谱,FWHM大于50nm,显示出较差的色纯度,阻碍了其在OLED显示中的应用。因此,开发具有窄FWHM的新型高效蓝紫色TADF材料迫在眉睫。
发明内容
为了克服现有技术存在的问题,本发明设计了一类反Kasha规则的窄谱带蓝紫光TADF材料,该类材料完美融合了高度扭曲的给-受体结构特征和多重共振(MR)特性,并在激发态下存在S1→S0和S2→S0两种辐射跃迁途径。在低极性环境下,以MR特性(S2→S0)辐射发光,在高极性环境下,以CT特性(S1→S0)辐射发光。该类材料克服了TADF发光机制导致的宽FWHM和光谱红移现象,实现了窄谱带蓝紫光TADF材料的高效发光及其在有机电致发光二极管中的应用。
本发明利用具有MR特性的2,12-二叔丁基-5,9-二氧杂-13b-硼萘并[3,2,1-de]蒽为受体,通过苯基π桥连,引入给体强度不同的咔唑和螺吖啶芴,构筑了一类反Kasha规则的窄谱带蓝紫光材料。
本发明提供的一类反Kasha规则的窄谱带蓝紫光TADF材料具有式(1)所示结构特征:
其中:
R独立地选自氢或者叔丁基。
优选的反Kasha规则的窄谱带蓝紫光TADF材料的具体结构如式(2):
本发明的另外一个目的是提供这类有机蓝紫发光材料的应用,将其作为发光层的客体发光材料用于制备蓝紫光OLED,以提高器件的发光色纯度,发光效率以及使用寿命。
本发明的近紫外OLED器件结构为:ITO/PEDOT:PSS/mCPCN:x wt%emitter/TmPyPB/LiF/Al。
其中,氧化锡铟(ITO)玻璃为阳极材料,PEDOT:PSS为空穴注入层材料,mCPCN为发光层主体材料,TmPyPB为电子传输层材料,LiF为电子注入层材料,金属铝(Al)为阴极材料。
优选为:ITO/PEDOT:PSS(40nm)/mCPCN:x wt%emitter(25nm)/TmPyPB(45nm)/LiF/Al。x wt%为蓝紫发光材料在mCPCN中的掺杂浓度为0.5~2wt%。
优选的应用方法中,有机蓝紫发光材料化合物1制备OLEDs的发光层,在mCPCN中的掺杂浓度为1wt%,并获得了外量子效率达9.61%,其色坐标为(0.164,0.045),FWHM为33nm。
相对于现在的技术,本发明的有益效果在于:
(1)本发明的有机蓝紫发光材料的分子结构简单、制备成本低。
(2)本发明的有机蓝紫发光材料具有多通道发光行为,克服了目前传统TADF材料因强ICT特性而引起的光谱红移及光谱展宽,这是首个具有窄谱带蓝紫光发射和多通道发光行为的TADF材料。材料的发光效率高、色纯度高,为高清显示创造了条件。研究结果表明:其溶液加工OLED器件凸显了发光效率高、色纯度优异等特点,器件的电致发光峰位于410nm,发光效率高达9.61%,半峰宽只有33nm,色坐标y轴仅为0.045,具有诱人的应用前景。
(3)本发明的有机蓝紫发光材料的热稳定性高,成膜行好。
附图说明
图1为本发明实施例1中化合物1的最优结构示意图。
图2为本发明实施例1中化合物1的前线轨道分布、能级排列、SOC和NTO分析。
图3为本发明实施例1中化合物1的热失重(TG)图。
图4为本发明实施例1中化合物1在甲苯溶液中的紫外-可见吸收光谱图、光致发光光谱图及低温荧光磷光光谱。
图5为本发明实施例1中化合物1在正己烷、甲苯、丁基醚、异丙醚、乙醚、乙酸乙酯、四氢呋喃、二氯甲烷、丙酮和乙腈溶液中的紫外-可见吸收光谱图。
图6为本发明实施例1中化合物1在正己烷、甲苯、丁基醚、异丙醚、乙醚、乙酸乙酯、四氢呋喃、二氯甲烷、丙酮和乙腈溶液中的光致发光光谱图。
图7为本发明实施例1中化合物1在1%掺杂mCPCN薄膜中的瞬时寿命曲线图。
图8为本发明实施例1中化合物1掺杂有机电致发光器件的电流密度与最大外量子效率关系图。
图9为本发明实施例1中化合物1掺杂有机电致发光器件的电致发光谱图。
具体实施方式
为了更清楚说明本发明,下面结合优选实施例和附图对本发明作进一步说明。本领域技术人员应当理解,下面所描述的具体内容是说明性的而非限制性的,不能因此限制本发明的保护范围。
本发明中,制备方法如无特殊说明均为常规方法。所用的原料如无特别说明均可以从公开的商业途径获得。
实施例1
化合物1的制备
本发明化合物1的具体合成路线如下:
将化合物1a(5g,15.68mmol)、化合物1b(8.76g,31.36mmol)、碳酸铯(15.33g,47mmol)溶于200mL N,N-二甲基甲酰胺溶液中,在氮气保护下,升温到120℃,搅拌反应一晚。冷却到室温,将300mL去离子水加入混合物中,搅拌10min,出现白色沉淀。抽滤,获得到白色沉淀,把沉淀转移入烧杯中,加入少许甲醇,打浆20min,抽滤,真空干燥8h,获得白色化固体化合物M1(11.5g,87%)。1H NMR(400MHz,CDCl3)δ8.15(t,J=1.9Hz,4H),7.92(d,J=1.7Hz,2H),7.53(dt,J=8.6,1.8Hz,4H),7.14(dd,J=8.6,1.9Hz,4H),1.47(s,36H).MALDI-MS(m/z):calcd.836.72 found.836.71.
在氮气条件下,将化合物M1(1g,1.19mmol)、化合物1c(0.40g,1.19mmol)、三(二亚苄基丙酮)二钯(22mg,0.03mmol)、1,1'-双(二苯基膦)二茂铁(DPPF)(27mg,0.05mmol)、叔丁醇钠(0.23g,2.38mmol)溶解在50mL甲苯中,升温到80℃,搅拌反应12h,然后降到室温。混合物经硅藻土,二氧化硅过滤,以及减压条件下浓缩。浓缩液经硅胶柱层析纯化(二氯甲烷/石油醚=1/4,v/v),获得白色固体M2(0.45g,36%)。1H NMR(400MHz,CDCl3)δ8.14-8.05(m,4H),7.78-7.63(m,4H),7.57-7.44(m,5H),7.36-7.18(m,7H),7.06(dt,J=24.3,7.2Hz,4H),6.69-6.49(m,4H),6.41-6.31(m,2H),1.40(d,J=4.7Hz,36H).MALDI-MS(m/z):calcd.1041.23 found.1041.22.
将化合物M2(0.4g,0.38mmol)、化合物1d(0.20g,0.40mmol)、Pd(PPh3)4(14mg,0.01mmol)、碳酸钾(0.11g,0.77mmol)溶解在四氢呋喃和水(20mL:5mL)的混合溶剂中。在氮气保护下,加热至80℃,搅拌反应24h。冷却到室温后将50mL去离子水添加到混合物,用二氯甲烷(3×50mL)萃取反应混合物,无水硫酸钠干燥,减压蒸馏去除溶剂,残渣经硅胶柱层析分离纯化(石油醚/二氯甲烷=5/1,v/v),得到白色固体化合物1(0.35g,68%)。1H NMR(400MHz,CDCl3)δ8.48(d,J=2.6Hz,2H),7.99-7.92(m,4H),7.88-7.83(m,2H),7.80-7.74(m,2H),7.61(dd,J=8.9,2.4Hz,2H),7.41(dd,J=8.6,1.8Hz,4H),7.37-7.25(m,8H),7.21-7.10(m,6H),6.82-6.79(m,2H),6.78-6.73(m,2H),6.68-6.61(m,2H),6.42(dt,J=7.5,1.4Hz,2H),1.36(d,J=16.8Hz,54H).MALDI-MS(m/z):calcd.1341.72found.1341.71.
实施例2
化合物2的制备
本发明化合物2的合成路线如下:
本发明化合物2的具体合成路线如下:
将化合物2a(5g,15.68mmol)、化合物2b(5.24g,31.36mmol)、碳酸铯(15.33g,47mmol)溶于200mL N,N-二甲基甲酰胺溶液中,在氮气保护下,升温到120℃,搅拌反应一晚。冷却到室温后,将300mL去离子水加入混合物中,搅拌10min,出现白色沉淀。采用布氏漏斗抽滤,获得到白色沉淀,把沉淀转移入烧杯中,加入少许甲醇,打浆,时间20min。抽滤后真空干燥8h,获得白色化固体化合物M3(11.5g,87%)。1H NMR(400MHz,CDCl3)δ8.15(d,J=7.6Hz,4H),7.98(d,J=0.8Hz,2H),7.50(t,J=7.8Hz,4H),7.32(t,J=7.8Hz,4H).7.19(d,J=8.0Hz,4H)MALDI-MS(m/z):calcd.611.97 found.611.93.
在氮气条件下,将化合物M3(1g,1.63mmol)、化合物2c(0.54g,1.63mmol)、三(二亚苄基丙酮)二钯(22mg,0.03mmol)、DPPF(27mg,0.05mmol)、叔丁醇钠(0.23g,2.38mmol)溶解在50mL甲苯中,升温到80℃,80℃搅拌12h,然后降温到室温。混合物经硅藻土,二氧化硅过滤,以及减压条件下浓缩。浓缩液经硅胶柱层析纯化(二氯甲烷/石油醚=1/4,v/v),获得白色固体M4(0.45g,36%)。1H NMR(400MHz,CDCl3)δ8.16-8.07(m,4H),7.76-7.62(m,4H),7.60-7.43(m,5H),7.35-7.20(m,7H),7.12-7.06(m,8H),6.70-6.50(m,4H),6.39-6.30(m,2H).MALDI-MS(m/z):calcd.815.19 found.815.15.
将化合物M4(0.4g,0.48mmol)、化合物2d(0.24g,0.48mmol)、Pd(PPh3)4(14mg,0.01mmol)、碳酸钾(0.11g,0.77mmol)溶解在四氢呋喃和水(20mL:5mL)的混合溶剂中,在氮气保护下,加热至80℃,搅拌反应24h。冷却到室温后,将50mL去离子水添加到混合物,用二氯甲烷(3×50mL)萃取反应混合物,无水硫酸钠干燥,减压蒸馏去除溶剂,残渣经硅胶柱层析分离纯化(石油醚/二氯甲烷=5/1,v/v),得到白色固体化合物2(0.38g,71%)。1H NMR(400MHz,CDCl3)δ8.48(d,J=2.5Hz,2H),7.96-7.90(m,4H),7.89-7.85(m,2H),7.81-7.73(m,2H),7.62(dd,J=9.0,2.5Hz,2H),7.42(dd,J=9.0,1.8Hz,4H),7.39-7.26(m,8H),7.23-7.12(m,10H),6.80-6.76(m,2H),6.79-6.72(m,2H),6.69-6.62(m,2H),6.43(dt,J=7.5,1.4Hz,2H),1.34(s,18H).MALDI-MS(m/z):calcd.1117.47 found.1117.49.
实施例3
将实施例1中的化合物1基于B3LYP/def2SVP基组,进行量子化学模拟计算化合物的最优几何空间构型,由图1可知,化合物1的MR骨架与苯桥之间的扭转角为56.55°,咔唑基与苯桥的扭转角为66.44°。由于螺芴结构的十字交叉构象特性,螺芴与相邻单元平面呈现出垂直构象,扭转角为90.56°。咔唑基的立体包覆很好的防止了分子间的聚集。
实施例4
在B3LYP/def2SVP基组上对实施例1中的化合物1进行了DFT和TD-DFT计算,获得了化合物1的前线轨道分布、能级排列、SOC和NTO。由图2可知,化合物1的S1态和S2态之间的能级几乎间并,存在S1态和S2态的竞争关系,S1态具有CT特性,而S2态具有MR特性。由SOC可以看出能级间存在多通道反系间穿越过程。
实施例5
将实施例1中的化合物1在30~700℃范围内,在N2保护下以20℃/min的速率升温,测得热失重曲线。由图3可知,化合物1分解5%的温度为459℃,表明材料具有较好的热稳定性。
实施例6
将实施例1中的化合物1溶解在甲苯溶液中(10-5M),测量了化合物1甲苯溶液室温下的紫外-可见光吸收光谱、光致发光光谱与77K下的低温荧光磷光光谱。由图4(a)可知,化合物1在350nm以下表现出强吸收带,这可分配给给体片段和氧桥联三芳胺片段的π→π*和n→π*跃迁,以及主要来自ICT作用的380nm附近的吸收带。化合物1在溶液中的发射峰为410nm,薄膜中的发射峰为408nm,在溶液和薄膜中均获得30nm的窄FWHM。在77K甲苯溶液中测量了化合物1的低温荧光光谱和磷光光谱,由图4(b)可知,化合物1的ΔEST为0.24eV。
实施例7
实施例1中的化合物1在不同溶液中的紫外-可见光吸收性能测试。将化合物1溶解在正己烷、甲苯、丁基醚、异丙醚、乙醚、乙酸乙酯、四氢呋喃、N,N-二甲基甲酰胺、丙酮和乙腈溶液中(浓度均为10-5M),测试其在不同溶液中的紫外-可见光吸收性能,如图5所示。由图可知,随着溶剂极性的增加,化合物的紫外-可见光吸收光谱没有出现明显变化。
实施例8
实施例1中的化合物1在不同溶液中的光致发光性能测试。将化合物1溶解在正己烷、甲苯、丁基醚、异丙醚、乙醚、乙酸乙酯、四氢呋喃、N,N-二甲基甲酰胺、丙酮和乙腈溶液中(浓度均为10-5M),测试其在不同溶液中的光致发光光谱,如图6所示。发现化合物随着溶剂极性的增强呈现明显的双峰发射,在低极性溶剂(从正己烷到乙醚)中展现出约410nm的窄谱带发射,意味着辐射跃迁主要发生在MR单元。随着溶剂极性的持续增加(从乙酸乙酯到二氯甲烷),出现了一个宽FWHM的CT峰在长波长处,并且该峰在强极性溶剂下(从丙酮到乙腈),发生持续的红移和FWHM的展宽。这一现象表明,化合物1存在两种不同的辐射跃迁途径(S1→S0和S2→S0),这与实施例4理论计算结果一致。
实施例9
实施例1中的化合物1在氮气氛围下测试了其在1%掺杂mCPCN薄膜中的荧光寿命,如图7所示,化合物1表现出具有纳秒级的延迟荧光分量和微秒级的延迟荧光分量。化合物1的短寿命为0.37ns,长寿命为0.25μs,这表明材料具有TADF特性。
实施例10
实施例1中的化合物1在有机电致发光器件中的应用。以化合物作为发光层客体材料制备结构为ITO/PEDOT:PSS(40nm)/mCPCN:x wt%emitter(25nm)/TmPyPB(45nm)/LiF/Al的有机电致发光二极管。其中,PEDOT:PSS为空穴注入层,mCPCN为发光层主体材料,TmPyPB为电子传输层,LiF为电子注入层,Al为阴极。如图8所示,在1wt%掺杂浓度时,化合物1掺杂器件获得了最好的电致发光性能,其最大外量子效率分别为9.61%。本实施例掺杂器件的电致发光性能参数记录在表1中。
表1本发明实施例中化合物1掺杂器件的电致发光性能参数
实施例11
实施例1中的化合物1在有机电致发光器件中的电致发光光谱。如图9所示,在0.5%、1%和2%掺杂浓度下,化合物1的掺杂器件显示了蓝紫光发射,其发射峰为410nm,即使在高掺杂下,也能保持极窄的半峰宽,这将有利于高清显示。
实施例12
将实施例中制备的二个化合物全部溶解在甲苯中配成10-5M溶液,测试其光致发光光谱、半峰宽、光量子效率、寿命。本实施例化合物1-2的光物理参数记录在表2中。
表2本发明实施例中化合物1-2的光物理参数
尽管结合了优选实施例对本发明进行了说明,但本发明并不局限于上述实施例,应当理解所附权利要求概括了本发明的范围。在本发明构思的指导下,本领域的技术人员应当意识到,对本发明的各实施例方案所进行的一定的改变,都将被本发明的权利要求书的精神和范围所覆盖。
Claims (5)
1.一类反Kasha规则的窄谱带蓝紫光TADF材料,其特征在于,窄谱带蓝紫光TADF材料化学结构如式(1)所示:
所述R分别独立地选自氢或者叔丁基。
2.根据权利要求1所述的反Kasha规则的窄谱带蓝紫光TADF材料,其特征在于,窄谱带蓝紫光TADF材料为以下化学结构式中的一种:
3.如权利要求1或2所述的反Kasha规则的窄谱带蓝紫光TADF材料的应用,其特征在于:窄谱带蓝紫光TADF材料作为发光材料用于有机电致发光器件中,制备蓝紫光OLED。
4.如权利要求3所述的反Kasha规则的窄谱带蓝紫光TADF材料的应用,其特征在于:窄谱带蓝紫光TADF材料作为发光层客体材料制备发光层。
5.如权利要求4所述的反Kasha规则的窄谱带蓝紫光TADF材料的应用,其特征在于:窄谱带蓝紫光TADF材料在发光层主体材料中的掺杂浓度为0.5~2wt%。
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