光电子快报(英文版), 2017, 13 (5): 325, Published Online: Sep. 13, 2018
Tandem organic light-emitting diodes with buffermodified C60/pentacene as charge generation layer
Abstract
Buffer-modified C60/pentacene as charge generation layer (CGL) is investigated to achieve effective performance of charge generation. Undoped green electroluminescent tandem organic light-emitting diodes (OLEDs) with multiple identical emissive units and using buffer-modified C60/pentacene organic semiconductor heterojunction (OHJ) as CGL are demonstrated to exhibit better current density and brightness, compared with conventional single-unit devices. The current density and brightness both can be significantly improved with increasing the thickness of Al. However, excessive thickness of Al seriously decreases the transmittance of films and damages the interface. As a result, the maximum current efficiency of 1.43 cd·A-1 at 30 mA·cm-22CO3/Al is an effective buffer for C60/pentacene-based tandem OLEDs.
WANG Zhen, ZHENG Xin, LIU Fei, WANG Pei, GAN Lin, WANG Jing-jing. Tandem organic light-emitting diodes with buffermodified C60/pentacene as charge generation layer[J]. 光电子快报(英文版), 2017, 13(5): 325.