摘要
利用CsN 3/Al/HAT-CN结构为电荷生成单元,实现了高性能叠层有机电致发光器件。制备了一组结构不同的黄绿双色叠层器件,通过器件性能分析阐明了CsN 3/Al/HAT-CN中电荷产生和传输的过程;利用Alq 3作发光层,制备了叠层器件T和单节器件S。叠层器件T的最大电流效率和最大功率效率分别为6.4 cd/A、2.3 lm/W;电流密度为20 mA/cm 2时,叠层器件T的电流效率和亮度分别为5.3 cd/A、1 064.9 cd/m 2,均约为单节器件S(2.7 cd/A、539.4 cd/m 2)的2倍,这证明了CsN 3/Al/HAT-CN可作为高效的电荷生成单元。通过研究叠层器件T的电致发光光谱和光强分布特性发现,器件T中无明显的微腔效应,其效率与亮度的提升是源自两个发光单元同时发光,而不是源自微腔效应。
An highly efficient tandem organic light-emitting device(OLED)was realized by employing multilayer structure of CsN 3/Al/HAT-CN as charge generation unit(CGU).The charge generation and transporting processes within CGU were discovered by analyzing electroluminescence properties of the fabricated dual-color tandem device with yellow and green emissions.The maximum efficiencies of Alq 3-based tandem device are as high as 6.4 cd/A and 2.3 lm/W,respectively,and at the given driving current density of 20 mA/cm 2,the current efficiency and luminance of tandem device are 5.3 cd/A and 1 064.9 cd/m 2,as are about 2-fold those of corresponding single-unit device.The results demonstrate CsN 3/Al/HAT-CN is able to function as CGU effectively.Finally,by studying the EL and emission pattern characteristics of the tandem device,we illustrated that the improvement on current efficiency and luminance results from simultaneous emission in two emitting layers under driving current density instead of the optical microcavity.
作者
彭雪康
林雯嫣
喻叶
吴志军
郭荣新
PENG Xue-kang;LIN Wen-yan;YU Ye;WU Zhi-jun;GUO Rong-xin(College of Information Science and Engineering,Huaqiao University,Xiamen 361021,China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2019年第10期1281-1287,共7页
Chinese Journal of Luminescence
基金
国家自然科学基金(61605049,11674111)资助项目~~
关键词
电荷生成单元
叠层结构
电子注入势垒
朗伯分布
charge generation unit
tandem structure
electron injection barrier
Lambertian distribution
