Recovery behavior of mixed layer organic light-emitting devices
Journal
Proceedings of SPIE - The International Society for Optical Engineering
Journal Issue
5937
Pages
59371B-1 - 59371B-8
Date Issued
2005
Author(s)
Abstract
In this report, we have investigated electroluminsecence (EL) characteristics and field-induced recovery of organic light-emitting devices (OLEDs) with a mixed emitting layer (EML). The mixed EML which is composed of a mixture of a hole transport layer (HTL), N,N'-diphenyl-N,N'-bis(1,1'-biphenyl)-4,4'-diamine (NPB), and an electron transport layer (ETL), bis(10-hydroxybenzo[h]quinolinato) beryllium (Bebq2), was fabricated by co-evaporation. Evident recovery of luminance-voltage characteristic was observed in the mixed device. It is explained by a dipole rearrangement model. The lifetime of this mixed layer OLED can reach 348 min. with initial luminance of 11,000 cd/m2 which is two times better that of the comparable heterojunction device.
SDGs
Type
conference paper