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Nondoped-type White Organic Light-Emitting Diode Using Star-Shaped Hexafluorenylbenzene as an Energy Transfer Layer
Jun-sheng Yu a*1, Tao Ma a1, Shuang-ling Lou a1, Ya-dong Jiang a1, Qing Zhang b*2
1.State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China;2.Department of Polymer Science, School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240, China
Abstract:
White organic light-emitting diodes (WOLEDs) with a structure of indium-tin-oxide (ITO)/N,N'-bis-(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine (NPB)/1,2,3,4,5,6-hexakis(9,9-diethyl-9H-fluoren-2-yl)benzene (HKEthFLYPh)/5,6,11,12 -tetraphenylnaphtacene (rubrene)/tris(8-hydroxyquinoline) aluminum (Alq3)/Mg:Ag were fabricated by vacuum deposition method, in which a novel star-shaped hexafluorenylbenzene HKEthFLYPh was used as an energy transfer layer, and an ultrathin layer of rubrene was inserted between HKEthFLYPh and Alq3 layers as a yellow light-emitting layer instead of using a time-consuming doping process. A fairly pure WOLED with Commissions Internationale De L'Eclairage (CIE) coordinates of (0.32, 0.33) was obtained when the thickness of rubrene was 0.3 nm, and the spectrum was insensitive to the applied voltage. The device yielded a maximum luminance of 4816 cd/m2 at 18 V.
Key words:  White organic light-emitting diode, Star-shaped hexafluorenylbenzene, 1,2,3,4,5,6-hexakis(9,9-diethyl-9H-fluoren-2-yl)benzene, Energy transfer, Ultrathin layer
FundProject:
Nondoped-type White Organic Light-Emitting Diode Using Star-Shaped Hexafluorenylbenzene as an Energy Transfer Layer
于军胜 a*1, 马涛 a1, 娄双玲 a1, 蒋亚东 a1, 张清 b*2
1.电子科技大学光电信息学院, 电子薄膜与集成器件国家重点实验室, 成都610054;2.上海交通大学化工化学学院,上海200240
摘要:
采用真空蒸镀的方法以星形六苯芴类新材料1,2,3,4,5,6-hexakis(9,9-diethyl-9H-fluoren-2-yl)benzene(HKEthFLYPh)作为能量传输层制备了indium-tin-oxide(ITO)/N,N′-bis-(1-naphthyl)-N,N′-diphenyl-(1,1'-biphenyl)-4,4′-diamine(NPB)/HKEthFLYPh/5,6,11,12-tetraphenylnaphtacene(rubrene)/tris(8-hydroxyquinoline) aluminum (Alq3)/Mg:Ag的白色有机电致发光器件. NPB和Alq3分别作为蓝色发光层和电子传输层,NPB和Alq3之间的超薄Rubrene层 作为黄色发光层. 结果表明,超薄rubrene层改善了白光器件的色纯度与稳定性,器件的光谱及色坐标几乎不随驱动电压的变化而改变.当rubrene层厚度为0.3 nm时,器件的Commissions Internationale De L′Eclairage (CIE)色坐标为(0.32,0.33). 驱动电压为18 V时,器件的最大亮度为4816 cd/m2.
关键词:  白光有机电致发光器件,HKEthFLYPh,星形六苯芴化合物,能量传输,超薄层
DOI:10.1088/1674-0068/21/05/500-504
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