Effect of Double Hole-Transporting Structure on Color Purity of Blue Organic Light-Emitting Diodes (BOLED)

Author:

Chen Kan Lin1,Huang Chien Jung2,Wu Zong Jin2,Kang Chih Chieh3,Chen Wen Ray4,Meen Teen Hang4

Affiliation:

1. Fortune Institute of Technology

2. National University of Kaohsiung

3. Southern Taiwan University of Science and Technology

4. National Formosa University

Abstract

A blue organic light-emitting diode (OLED) with a double hole-transporting (DHT) structure has been developed. The blue color purity was improved by modulation the thickness of CBP layer. When the thicknesses of left CBP and right CBP are respectively 8 nm and 2 nm, the more pure blue coordinates are (0.155, 0.079), which are very close to the blue coordinates of the national television system committee (NTSC) standard (0.14, 0.08). Furthermore the current density, brightness and the luminous efficiency of device with the left CBP of 8 nm and the right CBP of 2 nm are respectively 144.7 mA/cm2, 1065 cd/m2 and 0.93 cd/A.

Publisher

Trans Tech Publications, Ltd.

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