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:10.1117/12.905827

14 December 2011 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

Proceedings Volume 8312, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy III; 83120E (2011) https://doi.org/10.1117/12.905827
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China

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.

Citation Download Citation

Kwang-Cheol Lee, Deok Gi Kim, Sang-Mook Kim, Hwa-Sub Oh, and Jong Hyeob Baek "The influence of phosphor sedimentation on the white LEDs with different structure chip", Proc. SPIE 8312, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy III, 83120E (14 December 2011); https://doi.org/10.1117/12.905827

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