The Influence of Phosphor Sedimentation on the White LEDs with Different Structure Chip

Kwang-Cheol Lee; Deok Gi Kim; Sang-Mook Kim; Hwa-Sub Oh; Jong Hyeob Baek

doi:10.1364/ACP.2011.83120E

Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy
Proceedings of SPIE (Optica Publishing Group, 2011),
paper 83120E
•https://doi.org/10.1364/ACP.2011.83120E

The Influence of Phosphor Sedimentation on the White LEDs with Different Structure Chip

Kwang-Cheol Lee, Deok Gi Kim, Sang-Mook Kim, Hwa-Sub Oh, and Jong Hyeob Baek

Asia Communications and Photonics Conference and Exhibition 2011

Shanghai China
13–16 November 2011
ISBN: 978-0-8194-8960-9

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K. Lee, D. G. Kim, S. Kim, H. Oh, and J. H. Baek, "The Influence of Phosphor Sedimentation on the White LEDs with Different Structure Chip," in Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy, M. Gu, F. So, and X. Sun, eds., Vol. 8312 of Proceedings of SPIE (Optica Publishing Group, 2011), paper 83120E.

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Abstract

The influence of phosphor sedimentation on the white light-emitting diode with different structure chip was investigated. The phosphor sedimentation phenomenon occurred seriously as encapsulant viscosity lowers. The influence of phosphor sedimentation on the white light-emitting diode with the vertical structure chip whose one side only emits is larger than that of lateral structure chip whose all sides emit. Hence, Difference in luminous efficacy by the phosphor sedimentation reached about 20 % in the case with the vertical structure chip due to optical loss stemmed from the phosphor sediment layer.

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