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A simple method of fabricating efficient blue organic light-emitting diodes based on a double-dopant and a double-emissive layer with an effective hole-trapping architecture

H.-P. LIN1,* , X.-W. ZHANG2, D.-B. YU1, J. LI1, L. ZHANG1, F. ZHOU1, X.-Y. JIANG1,3, Z.-L. ZHANG1,3

Affiliation

  1. Department of Materials Science, Shanghai University, Jiading, Shanghai 201800, People's Republic of China
  2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004, People’s Republic of China
  3. Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai 200072, People's Republic of China

Abstract

This paper presents blue organic light-emitting diodes (BOLEDs) based on double-dopant and double-emissive layer (EML) structures. We first fabricated single-EML BOLEDs based on a double-dopant system: a blue fluorescent host of 4,40-bis(2,2-diphenylvinyl)-1,10-biphenyl (DPVBi) doped with a blue dopant of 1,4-bis[2-(3-N-ethylcarbazoryl)vinyl]benzene (BCzVB) and an assistant dopant of 2,3,6,7-tetrahydro-1,1,7,7,-tetramethyl-1H,5H,11H-10(2-benzothiazolyl) quinolizine-[9,9a,1gh]coumarin (C545T). Furthermore, we fabricated double-EML BOLEDs following the double-dopant structure: DPVBi doped with BCzVB is used as blue emitter, and this blue matrix doped with C545T is used as bluish-green emitter. The double-EML devices show a striking improvement in chromaticity and current efficiency as compared to the corresponding single-EML counterpart. This could be explained by the fact that the DPVBi layer impedes hole injection at the interface which greatly enhances the recombination of electron-hole pairs and hence improves the carriers balance in the emission region..

Keywords

Blue OLED, Double-dopant, Double-emissive layer, High current efficiency, Chromaticity, Energy transfer..

Submitted at: Oct. 27, 2010
Accepted at: Nov. 25, 2010

Citation

H.-P. LIN, X.-W. ZHANG, D.-B. YU, J. LI, L. ZHANG, F. ZHOU, X.-Y. JIANG, Z.-L. ZHANG, A simple method of fabricating efficient blue organic light-emitting diodes based on a double-dopant and a double-emissive layer with an effective hole-trapping architecture, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 12, pp. 2355-2362 (2010)