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27 August 2009 The design of the multiple resonance microcavity by reflection phase manipulation of non-QWS DBR for OLED chromaticity enhancement
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Abstract
There have been many researches regarding to the organic light-emitting diodes (OLEDs) with microcavity structures, in order to enhance its output optical properties such as chromaticity and intensity. In the applications to the white-light OLED (WOLED) and full color displays, the difficulty remains in the design of the optical length of the microcavity for proper resonance. A typical microcavity structure consists of the dielectric quarter wave stacks (QWS) as a distributed Bragg reflector (DBR) and the metal cathode to form a pair of mirrors. The organic and other material layers between the mirrors plays the role of the cavity. It can only have one major resonance peak in the perpendicular view angle and degrade the broad spectrum nature of the WOLED. Our study proposes the use of non-QWS mirror using thicker and higher-order (greater integral multiple of the quarter wavelength) of the dielectric layers. We can have the multiple resonance peak wavelengths to meet the WOLED requirement by introducing the reflection phase change of the dielectric stack mirror at certain wavelengths. The proposed microcavity structure yields a desired shift to the white point in CIE chromaticity for a typical green OLED. One of the potential applications of the microcavity with non-QWS mirror can be to make the WOLED even closer to the CIE white point without worrying the doping process variation, which is a typical problem in the WOLED. It greatly enhances the usability of the WOLED in various applications.
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Nien-Po Chen, Meng-Hsian Chou, Chao-Chen Wang, Cheng-Jung Hsieh, Yu-Cheng Chan, and Shu-Jin Kuo "The design of the multiple resonance microcavity by reflection phase manipulation of non-QWS DBR for OLED chromaticity enhancement", Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151K (27 August 2009); https://doi.org/10.1117/12.825550
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