Efficiency enhancement of fluorescent blue organic light-emitting diodes using doped hole transport

• 作 者: Nam Ho Kim You-Hyun Kim Ju-An Yoon Seung Ⅱ Yoo Kok Wai Cheah Furong Zhu Woo Young Kim
• 机 构: Department of Green Energy & Semiconductor Engineering,Hoseo University,Department of Physics,Hong K
• 出 处: Chinese Optics Letters
• 发表日期: 2016年04期
• 关键词: luminous exciton coordinates unchanged dopant optimize biphenyl diphenyl overlap

The electroluminescent characteristics of blue organic light-emitting diodes(BOLEDs) fabricated with doped charge carrier transport layers are analyzed. The fluorescent blue dopant BCzVBi is doped in an emissive layer,hole transport layer(HTL) and electron transport layer(ETL), respectively, to optimize the probability of exciton generation in the BOLEDs. The luminance and luminous efficiency of BOLEDs made with BCzVBi-doped HTL and ETL increase by 22% and 17% from 11,683 cd/m2 at 8.5 V and 6.08 cd/A at 4.0 V to 14, 264 cd/m2 at8.5 V and 7.13 cd/A at 4.0 V while CIE coordinates of(0.15, 0.15) of both types of BOLEDs remained unchanged. The electron mobility of BCzVBi is estimated to be 1.02 x 10_o cm2/Vs by TOF.

The fluorescent blue dopant BCzVBi is doped in an emissive layer, hole transport layer (HTL) and electron transport layer (ETL), respectively. The electroluminescent characteristics of blue organic light- emitting diodes (BOLEDs) fabricated with doped charge carrier transport layers , to optimize the probability of exciton generation in the BOLEDs. The luminance and luminous efficiency of BOLEDs made with BCzVBi-doped HTL and ETL increase by 22% and 17% from 11,683 cd / m2 at 8.5 V and 6.08 cd / A at 4.0 V to 14,264 cd / m2 at 8.5 V and 7.13 cd / A at 4.0 V while CIE coordinates of (0.15, 0.15) of both types of BOLEDs remain unchanged. The electron mobility of BCzVBi is estimated to be 1.02 x 10 - Vs by TOF.