High-contrast top-emitting organic light-emitting devices |
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Authors: | Chen Shu-Fen Chen Chun-Yan Yang Yang Xie Jun Huang Wei Shi Hong-Ying Cheng Fan |
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Institution: | Key Laboratory for Organic Electronics and Information Displays of Jiangsu Province, Institute ofAdvanced Materials, Nanjing University of Posts and Telecommunications, Nanjing 210046, China |
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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. |
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Keywords: | top-emitting organic light-emitting device contrast-enhancement stack anti-reflection |
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