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SpringerOpen, Nanoscale Research Letters, 1(7), 2012

DOI: 10.1186/1556-276x-7-188

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A novel randomly textured phosphor structure for highly efficient white light-emitting diodes

Journal article published in 2012 by Hsin Chu Chen ORCID, Kuo Ju Chen, Chao Hsun Wang, Chien Chung Lin, Chia Chi Yeh, Hsin Han Tsai, Min Hsiung Shih ORCID, Hao Chung Kuo, Tien Chang Lu ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract We have successfully demonstrated the enhanced luminous flux and lumen efficiency in white light-emitting diodes by the randomly textured phosphor structure. The textured phosphor structure was fabricated by a simple imprinting technique, which does not need an expensive dry-etching machine or a complex patterned definition. The textured phosphor structure increases luminous flux by 5.4% and 2.5% at a driving current of 120 mA, compared with the flat phosphor and half-spherical lens structures, respectively. The increment was due to the scattering of textured surface and also the phosphor particles, leading to the enhancement of utilization efficiency of blue light. Furthermore, the textured phosphor structure has a larger view angle at the full width at half maximum (87°) than the reference LEDs.