Solidly mounted resonators consisting of a molybdenum and titanium Bragg reflector |
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Authors: | Ching-Liang Wei Ying-Chung Chen Chien-Chuan Cheng Kuo-Sheng Kao |
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Institution: | (1) Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong |
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Abstract: | Bright and efficient stacked color-tunable organic light emitting devices (OLEDs) using an intermediate Al/Au electrode have
been reported. The effects of the thicknesses of Al and Au layers on the luminance characteristics have been comprehensively
studied. After optimization, the bottom-emission single-unit OLED of 4,4′,4′′-Tris(N-3-methylphenyl-N-phenyl-amino) triphenylamine/N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1,1′-biphenyl)-4,4′-diamine/tris(8-hydroxyquinoline) aluminum has a maximum luminance efficiency (ηL) of 3.37 cd/A by using Al/Au as the cathode and 2.92 cd/A by using Al/Au as the anode. Meanwhile, by introducing the optimized
intermediate Al/Au electrode into the stacked color-tunable (red to blue) OLEDs, a red unit with maximum ηL of 4.73 cd/A and a blue unit with maximum ηL of 3.96 cd/A have been obtained. The color can be tuned efficiently along a linear route from pure red with the Commission
Internationale de l’Eclairage (CIE) coordinates of (0.662, 0.330) to sky blue with the CIE coordinates of (0.155, 0.340).
This scheme can be a potential candidate for achieving high-brightness and efficient stacked color-tunable OLEDs.
PACS 78.60.Fi; 78.66.Qn; 81.05.Lg; 85.30.De |
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Keywords: | |
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