EFFICIENT DEEP-RED ORGANIC LIGHT-EMITTING DIODES BASED ON BLENDING MEH-PPV WITH A SMALL MOLECULE COMPOUND

被引：2
|
作者：
Li, Chun [1 ]
Huang, Ju [1 ]
Zou, Jian-hua [1 ]
Xu, Miao [1 ]
Zeng, Wen-jin [1 ]
Peng, Jun-biao [1 ]
机构：
[1] S China Univ Technol, Key Lab Special Funct Mat MOE, Inst Polymer Optoelect Mat & Devices, Guangzhou 510640, Peoples R China
来源：
CHINESE JOURNAL OF POLYMER SCIENCE | 2011年 / 29卷 / 05期
基金：
中国国家自然科学基金;
关键词：
MEH-PPV; Organic light-emitting diodes; Red electroluminescence; Soluble small molecule; HIGHLY EFFICIENT; ELECTROLUMINESCENCE; DEVICE; PHOTOLUMINESCENCE; PHOSPHORESCENT; EMISSION;
D O I：
10.1007/s10118-011-1076-0
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Efficient deep-red organic light-emitting diodes (OLEDs) were investigated based on the blend of poly[2-methoxy-5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) with 4,7-bis(5-(7-(9H-carbazol-9-yl)-9,9-dioctyl-9H-fluoren-2-yl) thiophen-2-yl)benzo[c] [1,2,5] thiadiazole (compound 1). By optimizing the blend ratio, the turn-on voltage of the devices was significantly reduced from 4.9 V to 2.4 V. A highest external quantum efficiency of 2.56% was achieved at a blend ratio of 95: 5 (wt) for compound 1: MEH-PPV. The CIE coordinate was measured to be (0.70, 0.30), with the luminescence peak at around 680 nm. Based on experimental observations the improvement mechanism is described.
引用
收藏
页码：609 / 614
页数：6
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