一种新型结构的黄光有机电致发光器件  

A Novel Yellow Organic Light-Emitting Device

作　　者：马晨 王华[1] 郝玉英[2] 高志翔[2] 周禾丰[1] 许并社[1] 

机构地区：[1]太原理工大学新材料界面科学与工程教育部重点实验室 [2]太原理工大学理学院,山西太原030024

出　　处：《光谱学与光谱分析》2008年第7期1479-1482,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金重大研究计划项目(90306014);国家自然科学基金项目(20671068);山西省自然科学基金项目(20041066);山西省科技攻关项目(200631121)资助

摘　　要：用有机荧光染料罗丹明B(Rhodamine B)作为掺杂剂,采用双量子阱结构制备了一种新型的黄光有机电致发光器件,器件结构及各层厚度为:ITO/CuPc(6nm)/NPB(20nm)/Alq3(3nm)/Alq3∶Rhodamine B(3nm)/Alq3(3nm)/Alq3∶Rhodamine B(3nm)/Alq3(30nm)/Liq(5nm)/Al(30nm)。研究发现Rhodamine B的掺杂浓度对该器件的发光亮度和发光效率有较大影响。当Rhodamine B的掺杂浓度为1.5wt%时,得到了最大电流效率1.526cd.A-1,最大发光亮度1309cd.m-2的黄光有机电致发光器件。由器件的电致光谱曲线,可以看到在发光层之间存在着Alq3向RhB传递能量的过程。由于量子阱的斯托克斯效应与RhB染料分子间的自极化作用,随着掺杂浓度的增加,λmax出现明显红移。The fabrication of a novel organic yellow-light-emitting device using Rhodamine B as dopant with double quantum-well （DQW） structure was introduced in the present article. The structure and thickness of this device is ITO/CuPc（6 nm）/NPB（20 nm）/Alq3 （3 nm）/Alq3 ： Rhodamine B（3 nm） /Alq3 （3 nm）/Alq3 ： Rhodamine B（3 nm）/Alq3 （30 nm）/Liq（5 nm）/Al（30 nm）. With the detailed investigation of electroluminescence of the novel organic yellow-light-emitting device, the authors found that the doping concentration of Rhodamine B（RhB） had a very big influence on luminance and efficiency of the organic yellow-light- emitting device. When doping concentration of Rhodamine B （RhB） was 1.5 wt%, the organic yellow-light-emitting device was obtained with the maximum current efficiency of 1. 526 cd· A^-1 and the maximum luminance of 1 309 cd · m^-2. It can be seen from the EL spectra of the devices that there existed energy transferring from Alq3 to RhB in the organic light-emitting layers. When the doping concentration of RhB increased, λmax of EL spectra redshifted obviously. The phenomenon was attributed to the Stokes effect of quanturn wells and self-polarization of RhB dye molecules.

关 键 词：罗丹明B 双量子阱 掺杂 OLED 

分 类 号：O428.3[理学—声学]