High-contrast top-emitting organic light-emitting devices

doi:10.1088/1674-1056/21/10/108506

Abstract In this paper we report on a high-contrast top-emitting organic light-emitting device utilizing a moderate-reflection contrast-enhancement stack and a high refractive index anti-reflection layer. The contrast-enhancement stack consists of a thin metal anode layer, a dielectric bilayer, and a thick metal underlayer. The resulting device, with the optimized contrast-enhancement stack thicknesses of Ni (30 nm)/MgF₂ (62 nm)/ZnS (16 nm)/Ni (20 nm) and the 25-nm-thick ZnS anti-reflection layer, achieves a luminous reflectance of 4.01% in the visible region and a maximum current efficiency of 0.99 cd/A (at 62.3 mA/cm²) together with a very stable chromaticity. The contrast ratio reaches 561:1 at an on-state brightness of 1000 cd/m² under an ambient illumination of 140 lx. In addition, the anti-reflection layer can also enhance the transmissivity of the cathode and improve light out-coupling by the effective restraint of microcavity effects.

Keywords: top-emitting organic light-emitting device contrast-enhancement stack anti-reflection

Received: 14 March 2012
Revised: 22 May 2012
Accepted manuscript online:

PACS:	85.60.Jb	(Light-emitting devices)
	78.60.Fi	(Electroluminescence)
	78.66.Qn	(Polymers; organic compounds)
	78.40.-q	(Absorption and reflection spectra: visible and ultraviolet)

Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No. 2009CB930600), the National Natural Science Foundation of China (Grant Nos. 60907047, 61274065, 60977024, 21101095, 20974046, 21003076, 51173081, and 61136003), the Specialized Research Foundation for the Doctoral Program of Higher Education, China (Grant No. 20093223120003), the Natural Science Foundation of Institutions of Higher Education of Jiangsu Province, China (Grant Nos. SJ209003, 09KJB150009, 10KJB510013, and TJ209035), the "Qing Lan" Program of Jiangsu Province, China, and the Program of Nanjing University of Posts and Telecommunications, China (Grant Nos. NY210015, NY211069, and NY210040).

Corresponding Authors: Huang Wei
E-mail: wei-huang@njupt.edu.cn

Cite this article:

Chen Shu-Fen (陈淑芬), Chen Chun-Yan (陈春燕), Yang Yang (杨洋), Xie Jun (谢军), Huang Wei (黄维), Shi Hong-Ying (石弘颖), Cheng Fan (程凡) High-contrast top-emitting organic light-emitting devices 2012 Chin. Phys. B 21 108506

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