基于双[2-(9,9-二己基-9H-芴-2-基)喹啉 C3,N]乙酰丙酮合铱(III)的红光发射寡聚芴电磷光二极管及界面修饰的溶剂处理。

Red-emission oligofluorene electrophosphorescent diodes based on bis[2-(9,9-dihexyl-9H-fluoren-2-yl)quinolineC3,N]acetylacetonatoiridium(III) and solvent treatment for interface modification.

机构信息

Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, California 90095, USA.

出版信息

ACS Appl Mater Interfaces. 2009 Jan;1(1):76-82. doi: 10.1021/am8000133.

DOI:10.1021/am8000133

PMID:20355757

Abstract

Efficient solution-processed organic light emitting diodes based on oligofluorene doped with bis[2-(9,9-dihexyl-9H-fluoren-2-yl)quinoline-C3,N]- acetylacetonatoiridium(III) [Ir(C6flq)2(acac)] have been demonstrated. The oligofluorene and [Ir(C6flq)2(acac)] show excellent solubility and processibility, with a device performance of 7.83+/-0.52 cd A(-1) and 3.30+/-0.10 lm W(1-) at 2479+/-45 cd m(-2) brightness with Commission International de L'Eclairage coordinates (0.66, 0.33). It was discovered that the efficiency can be further enhanced by exposing the finished organic thin film to a polar solvent or solvent vapor before deposition of the cathode contact. As a result, a peak efficiency of 12.20+/-0.16 cd A(-1) and 6.35+/-0.03 lm W(1-) at 1821+/-238 cd m(-2) brightness is achieved. This efficiency enhancement can be attributed to the presence of interface dipoles between the light-emitting layer and cathode contact.

摘要

基于聚芴掺杂双[2-(9,9-二己基-9H-芴-2-基)喹啉-C3,N]-乙酰丙酮合铱(III) [Ir(C6flq)2(acac)]的高效溶液处理有机发光二极管已经得到证明。聚芴和[Ir(C6flq)2(acac)]具有优异的溶解性和加工性能，器件性能为 7.83+/-0.52 cd A(-1)，在 2479+/-45 cd m(-2)亮度下，CIE 坐标为(0.66, 0.33)，电流效率为 3.30+/-0.10 lm W(-1)。研究发现，在沉积阴极接触之前，将完成的有机薄膜暴露于极性溶剂或溶剂蒸气中，可以进一步提高效率。因此，在 1821+/-238 cd m(-2)亮度下，峰值效率达到 12.20+/-0.16 cd A(-1)，功率效率为 6.35+/-0.03 lm W(-1)。这种效率的提高可以归因于发光层和阴极接触之间存在界面偶极子。