发光学报2011，Vol.32Issue(4)：387-392,6.DOI:10.3788/fgxb20113204.0387
n型掺杂PTCDA复合材料对有机发光二极管性能的提高
Lithium Carbonate Doped 3,4,9,10-perylenetetracarboxylic Dianhydride for Enhanced Performance in Organic Light Emitting Diode
摘要
Abstract
Lithium carbonate doped 3,4,9,10-perylenetetracarboxylic dianhydride ( Li2CO3∶ PTCDA) was fabricated as electron injection layer in NPB/AIq3 heterojunction based organic light emitting diodes (OLEDs). It was found that the current of OLED using Li2CO3∶ PTCDA was strongly dependent on the Li2CO3 doping concentration. The OLED using Li2CO3∶ PTCDA( 1∶1 ) with A1 as the cathode exhibits an improved power etficiency and significantly increased luminance, comparing with the one using Li2CO3∶ BCP(1∶4) with Al as the cathode and the one using the regular LiF/Al cathode. It is because the electron conductivity for Li2CO3∶ PTCDA/( 1∶1 ) is much higher than that Li2CO3∶ BCP(1∶4) and neat Alq3. In addition, it is found that there exist a Schottky barrier at the intrinsic interface of Alq3 and Li2CO3∶ PTCDA( 1∶1 ), which suppress the electron transfer from Li2CO3∶ PTCDA( 1∶1 ) into Alq3. However, the release of Li atoms upon the Al deposition onto 1∶1 Li2CO3∶ PTCDA could turn the interface into an ohmic contact, thereby delivering efficient electron injection from Li2CO3∶ PTCDA( 1∶1 ) into Alq3. We provided a class of high-function, low-cost, and easily fabricated n-doped material for the performance enhancement of OLEDs.关键词
有机发光二极管/n型掺杂/PTCDA/BCPKey words
organic light emitting diodes/ n-type doping/ PTCDA/ BCP分类
信息技术与安全科学引用本文复制引用
程翠然,陈玉焕,秦大山,全威,刘金锁..n型掺杂PTCDA复合材料对有机发光二极管性能的提高[J].发光学报,2011,32(4):387-392,6.基金项目
国家自然科学基金(50803014)资助项目 （50803014）
