Lighting object-based nondoped-type white organic light-emitting diode with N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1,1′ -benzidine)-4, 4′ -diamine as the chromaticity-tuning layer

Document Type

Article

Publication Date

12-15-2007

Abstract

We demonstrate a nondoped white organic light-emitting diode in which the blue, green, and red emissions are generated from 4,4′-bis(2,2′- diphenylvinyl)-1,1′-biphenyl, tris(8-hydroxyquinoline)aluminum, and a submonolayer of 4-(dieyanomethylene)-2-t-butyl-6-(1,1,7,7- tetramethyl-julolidyl 9-enyl)-4H-pyran layers, respectively. A thin layer of N,N′-diphenyl-N, N′-bis(1-naphthyl)(1,1′-benzidine)-4,4′-diamine (NPB), which differed from the traditional hole-transporting layer, was introduced into the device. The thickness of this thin NPB layer was changed to tune the chromaticity and optimize the white color quality. The white device with a 3 nm chromaticity-tuning NPB layer gives the Commission Internationale de l'Eclairage-1931 xy coordinate of (0.327, 0.336), a color rendering index of 90.2, a maximum luminance of 19,096 cd/m2, and a maximum current efficiency of 4.12 cd/A. The electroluminescence mechanism of the white device was also discussed. © 2007 Optical Society of America.

Publication Source (Journal or Book title)

Optics Letters

First Page

3537

Last Page

3539

This document is currently not available here.

Share

COinS