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Proceedings Paper

High-quality quantum-dot-based full-color display technology by pulsed spray method
Author(s): Kuo-Ju Chen; Hsin-Chu Chen; Kai-An Tsai; Chien-Chung Lin; Hsin-Han Tsai; Shih-Hsuan Chien; Bo-Siao Cheng; Yung-Jung Hsu; Min-Hsiung Shih; Hao-Chung Kuo
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Paper Abstract

We fabricated the colloidal quantum-dot light-emitting diodes (QDLEDs) with the HfO2/SiO2-distributed Bragg reflector (DBR) structure using a pulsed spray coating method. Moreover, pixelated RGB arrays, 2-in. wafer-scale white light emission, and an integrated small footprint white light device were demonstrated. The experimental results showed that the intensity of red, blue, and green (RGB) emissions exhibited considerable enhancement because of the high reflectivity in the UV region by the DBR structure, which subsequently increased the use in the UV optical pumping of RGB QDs. In this experiment, a pulsed spray coating method was crucial in providing uniform RGB layers, and the polydimethylsiloxane (PDMS) film was used as the interface layer between each RGB color to avoid crosscontamination and self-assembly of QDs. Furthermore, the chromaticity coordinates of QDLEDs with the DBR structure remained constant under various pumping powers in the large area sample, whereas a larger shift toward high color temperatures was observed in the integrated device. The resulting color gamut of the proposed QDLEDs covered an area 1.2 times larger than that of the NTSC standard, which is favorable for the next generation of high-quality display technology.

Paper Details

Date Published: 4 March 2013
PDF: 6 pages
Proc. SPIE 8641, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVII, 864121 (4 March 2013); doi: 10.1117/12.2004101
Show Author Affiliations
Kuo-Ju Chen, National Chiao Tung Univ. (Taiwan)
Hsin-Chu Chen, National Chiao Tung Univ. (Taiwan)
Kai-An Tsai, National Chiao Tung Univ. (Taiwan)
Chien-Chung Lin, National Chiao Tung Univ. (Taiwan)
Hsin-Han Tsai, National Chiao Tung Univ. (Taiwan)
Shih-Hsuan Chien, National Chiao Tung Univ. (Taiwan)
Bo-Siao Cheng, National Chiao Tung Univ. (Taiwan)
Yung-Jung Hsu, National Chiao Tung Univ. (Taiwan)
Min-Hsiung Shih, Research Ctr. for Applied Sciences (Taiwan)
Hao-Chung Kuo, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8641:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVII
Klaus P. Streubel; Heonsu Jeon; Li-Wei Tu; Martin Strassburg, Editor(s)

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