Highly efficient ultraviolet organic light-emitting diodes and interface study using impedance spectroscopy

被引：14
作者：
Zhang, Qi [1 ,2 ]
Zhang, Xiaowen [3 ]
Wei, Bin [1 ,2 ]
机构：
[1] Shanghai Univ, Minist Educ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China
[2] Shanghai Univ, Minist Educ, Key Lab Adv Display & Syst Applicat, Shanghai 200072, Peoples R China
[3] Guilin Univ Elect Technol, Guangxi Key Lab Informat Mat, Guilin 541004, Peoples R China
来源：
OPTIK | 2015年 / 126卷 / 18期
基金：
中国国家自然科学基金;
关键词：
Ultraviolet organic light-emitting diodes; Interlayer; High efficiency; Hole injection; DEVICES; ELECTROLUMINESCENCE; INDEX;
D O I：
10.1016/j.ijleo.2015.05.091
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We have investigated the properties of ultraviolet organic light-emitting diodes (UV OLEDs) using an oxadiazole compound (OXD-7) as emitting materials and MoO3 as hole injection and buffer material. Results have demonstrated that the introduction of MoO3 can achieve a highly efficient UV OLED, which shows a high external quantum efficiency of 1.43% with a peak wavelength of 388 nm. The impedance spectroscopy elucidates that the hole injection voltage is about 2 V (via MoO3 interlayer) and 5 V (without MoO3 interlayer), indicating that the MoO3 interlayer is critical to promote hole injection and achieve high device efficiency. (C) 2015 Elsevier GmbH. All rights reserved.
引用
收藏
页码：1595 / 1597
页数：3
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