Title: A novel randomly textured phosphor structure for highly efficient white light-emitting diodes
Authors: Chen, Hsin Chu
Chen, Kuo Ju
Wang, Chao Hsun
Lin, Chien Chung
Yeh, Chia Chi
Tsai, Hsin Han
Shih, Min Hsiung
Kuo, Hao Chung
Lu, Tien Chang
Department of Photonics
Keywords: white light-emitting diodes;imprinting;phosphor;texture;package
Issue Date: 16-Mar-2012
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 (87A degrees) than the reference LEDs.
URI: http://dx.doi.org/10.1186/1556-276X-7-188
ISSN: 1931-7573
DOI: 10.1186/1556-276X-7-188
Volume: 7
Begin Page: 1
End Page: 5
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