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The effect of spacer in hybrid white organic light emitting diodes

ISSN号：1001-6538
期刊名称：Chinese Science Bulletin
时间：2014.9
页码：3090-3097
分类：TN312.8[电子电信—物理电子学] TQ051.72[化学工程]
作者机构：[1]Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China, [2]New Vision Opto-Electronic Technology Co., Ltd,Guangzhou 510310, China
相关基金：This work was supported by the National Basic Research Program of China （2009CB623604）, the National Natural Science Foundation of China （61204087, 51173049, U0634003, 61036007, and 60937001）, Fundamental Research Funds for the Central Universities （2011ZB0002, 2011ZM0009）, and China Post doctoral Science Foundation （2013M531841）.
相关项目：金属氧化物薄膜晶体管稳定性机理的研究

作者： Gao, Dongyu|Zou, Jianhua|Lan, Linfeng|Peng, Junbiao|

关键词：有机发光二极管, 混合, 隔离物, 极性材料, 器件性能, 能量转移, 蓝色荧光, 有效利用, Organic light emitting diodes , White light , Spacer , Efficiency, Bright

中文摘要：

射出二极管的二种高度有效的、明亮混合的白器官的光被利用双极性的材料 4,4-N， N-dicarbazolebiphenyl (CBP ) 和单极的材料 N 制作了， N-di (naphthalene-1-yl )-N,N-diphenyl-benzidine (NPB ) 作为分隔符分别地。由和有效地利用利用激子的 orange-phosphorescence/blue-fluorescence 的联合调整分隔符的厚度，有 CBP 分隔符的最佳的设备和有 NPB 分隔符的设备的当前的效率是 31.0 和 38.9 ? cd/A ，最大的力量效率是 23.9 和 29.1 ? lm/W ，最大的亮度是 87,249 和 75,501 ? cd/m <啜class=“ a-plus-plus ”> 2 ,和 de lEclairage ( CIE )协调的委员会共产国际歌是( 0.42 ， 0.43 )并且( 0.47 ， 0.44 )在电压而且，在设备性能上集中于分隔符的效果的系统的调查被执行了。由多功能的分隔符的优点，当搬运人能仍然通过这座分隔符桥时，在发磷光、荧光灯的 emitters 之间的精力转移能被避免，它是重要的认识到如此的高设备表演。另外，如果有高三位字节精力的分隔符的厚度被优化，双极性的材料和单极的材料能是分隔符的有希望的候选人的一个新奇概念被建议了。

英文摘要：

Two kinds of highly efficient, bright hybrid white organic light emitting diodes have been fabricated by utilizing ambipolar material 4,4-N,N-dicarbazolebiphenyl （CBP） and unipolar material N,N′-di（naphthalene-l-yl）- N,N′-diphenyl-benzidine （NPB） as the spacer, respectively. By adjusting the thickness of spacers together with effec- tively utilizing combinations of exciton-harnessed orangephosphorescence/blue-fluorescence, the current efficiency of optimal device with CBP spacer and device with NPB spacer are 31.0 and 38.9 cd/A, the maximum power efficiency are 23.9 and 29.1 lm/W, the maximum brightness are 87,249 and 75,501 cd/m2, and the Commission Inter- nationale de l＇Eclairage （CIE） coordinates are （0.42, 0.43） and （0.47, 0.44） at a voltage of 11 V, respectively. Furthermore, systematic investigations focused on the effects of spacers on device performance have been performed. By virtue of the multifunctional spacer, energy transfer between the phosphorescent and fluorescent emitters can be avoided while the carriers still can pass through this spacer bridge, which is important to realize such high device performance. In addition, a novel concept that both ambipolar materials and unipolar materials can be the promising candidates for spacers has been proposed if the thickness of spacers with high triplet energy is optimized.