MA Chen1,2,WANG Hua1,2,HAO Yu-ying3,GAO Zhi-xiang3,4,ZHOU He-feng1,2,XU Bing-she1,2*
1. Key Laboratory of Interface Science and Engineering and in Advanced Materials of Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China 2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China 3. College of Science, Taiyuan University of Technology, Taiyuan 030024, China 4. College of Physics and Electronic Sciences, Datong University, Datong 037009, China
Abstract: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, λ max of EL spectra redshifted obviously. The phenomenon was attributed to the Stokes effect of quantum wells and self-polarization of RhB dye molecules.
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