High-Efficiency Phosphorescent White Organic Light-Emitting Diodes with Stable Emission Spectrum Based on RGB Separately Monochromatic Emission Layers  

作　　者：ZHANG Zhi-Qiang LIU Yi-Peng DAI Yan-Feng CHEN Jiang-Shan MA Dong-Ge ZHANG Hong-Mei 

机构地区：[1]State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chan~chun 130022 [2]University of Chinese Academy of Sciences, Beijing 100049 [3]Department of Materials Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210023

出　　处：《Chinese Physics Letters》2014年第4期122-125,共4页中国物理快报（英文版）

基　　金：Supported by the Science Fund for Creative Research Groups of the National Natural Science Foundation of China under Grant No 20921061, the National Natural Science Foundation of China under Grant Nos 50973104, 60906020, 21161160442, 61036007 and 60937001, the Ministry of Science and Technology of China under Grant Nos 2009CB623604 and 2009CB930603, and the Foundation of Jilin Research Council under Grant No 2012ZDGG001, 20090127 and 201105028.

摘　　要：Highly efficient phosphorescent white organic light-emitting diodes （WOLEDs） with stable emission spectra are successfully fabricated by using an RGB three-color separately monochromatic emission layer （EML） struc- ture. The EML consists of a sequence of bis（2-methyldibenzo[f, h]quinoxaline） （acetylacetonate） iridium （Ⅲ） （Ir（MDQ）2（acac）） doped tris（4-carbazoyl-9-ylphenyl）amine （TCTA） as the red emission layer, iridium, tris（2- phenylpyidine）（Ir（ppy）3） doped TCTA as the green emission layer and iridium（Ill） Ibis（4, 6-difuorophenyl）- pyridinato-N, C2＇]picolinate （FIrpic） doped a mixed-host of TCTA and tris（4-carbazoyl-9-ylphenyl）amine （26DCz PPy） as the blue emission layer. Without using any out-coupling techniques, the resulting WOLEDs achieve a power efficiency of 421m/W at lOO cd/m2, and 34 lm/W at 1000 cd/m2. The WOLEDs also show excellent spec- trum stability with bias voltages, remaining the Commission Internationale de L＇Eclairage coordinates at （0.44, 0.43） from 1000 cd/m2 to 10000 cd/m2 and the color rendering index is as high as over 80. We contribute the sta- ble emission spectrum to the RGB separate EML structure that successfully suppresses the undesired competition between host-guest energy transfer and direct exciton formation on emissive dopants by effectively controlling the position of exciton recombination region.Highly efficient phosphorescent white organic light-emitting diodes （WOLEDs） with stable emission spectra are successfully fabricated by using an RGB three-color separately monochromatic emission layer （EML） struc- ture. The EML consists of a sequence of bis（2-methyldibenzo[f, h]quinoxaline） （acetylacetonate） iridium （Ⅲ） （Ir（MDQ）2（acac）） doped tris（4-carbazoyl-9-ylphenyl）amine （TCTA） as the red emission layer, iridium, tris（2- phenylpyidine）（Ir（ppy）3） doped TCTA as the green emission layer and iridium（Ill） Ibis（4, 6-difuorophenyl）- pyridinato-N, C2＇]picolinate （FIrpic） doped a mixed-host of TCTA and tris（4-carbazoyl-9-ylphenyl）amine （26DCz PPy） as the blue emission layer. Without using any out-coupling techniques, the resulting WOLEDs achieve a power efficiency of 421m/W at lOO cd/m2, and 34 lm/W at 1000 cd/m2. The WOLEDs also show excellent spec- trum stability with bias voltages, remaining the Commission Internationale de L＇Eclairage coordinates at （0.44, 0.43） from 1000 cd/m2 to 10000 cd/m2 and the color rendering index is as high as over 80. We contribute the sta- ble emission spectrum to the RGB separate EML structure that successfully suppresses the undesired competition between host-guest energy transfer and direct exciton formation on emissive dopants by effectively controlling the position of exciton recombination region.

分 类 号：TN312.8[电子电信—物理电子学] O657.31[理学—分析化学]