A novel yellow organic light-emitting device

作者：Ma Chen; Wang Hua; Hao Yu ying; Gao Zhi xiang; Zhou He feng; Xu Bing she^*

来源：Spectroscopy and Spectral Analysis, 2008, 28(7): 1479-1482.

• rhodamine B
• double quantum-well
• doping
• OLED

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 rim)/NPB(20 nm)/Alq(3)(3 nm)/Alq(3) : Rhodamine B(3 nm)/Alq3(3 nm)/Alq(3) : Rhodamine B(3 nm)/Alq(3)(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 Alq(3) to RhB in the organic light-emitting layers. When the doping concentration of RhB increased, lambda(max) of EL spectra redshifted obviously. The phenomenon was attributed to the Stokes effect of quantum wells and self-polarization of RhB dye molecules.

• 出版日期2008-7
• 单位太原理工大学; 山西大同大学