Tetra-Chromatic White Phosphorescent Organic Light-emitting Diodes with an External Color Tuning Layer

  • Chang, Chi-Sheng (Dept. of Photonics and Display Institute, National Chiao Tung University) ;
  • Liu, Po-Tsun (Dept. of Photonics and Display Institute, National Chiao Tung University) ;
  • Ho, Meng-Huan (Dept. of Photonics and Display Institute, National Chiao Tung University) ;
  • Chen, Chin-H. (Dept. of Photonics and Display Institute, National Chiao Tung University)
  • Published : 2008.10.13

Abstract

A highly efficient white phosphorescent OLED with a "tetra-chromatic" emission was fabricated by using an external color tuning layer (ECTL) which is composed of a layer of greenish yellow organic dye dispersed in PMMA on the outside of the glass. The ECTL combining with a lower red dopant concentration in the device has been found to improve the efficiency of a conventional WOLED by more than 27%.

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