The influence of phosphor sedimentation on the white LEDs with different structure chip

Author

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

Author_Institution

LED Device Res. Center, Korea Photonics Technol. Inst., Gwangju, South Korea

fYear

2011

fDate

13-16 Nov. 2011

Firstpage

1

Lastpage

4

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.

Keywords

integrated optoelectronics; light emitting diodes; optical losses; phosphors; sedimentation; luminous efficacy; optical loss; phosphor sedimentation; vertical structure chip; white LED; white light-emitting diode; Abstracts; Electronic publishing; Information services; Internet; Substrates; Sun; White LEDs; encapsulation; high-power LED; phosphor; sedimentation;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Photonics Conference and Exhibition, 2011. ACP. Asia

Conference_Location

Shanghai

ISSN

2162-108X

Print_ISBN

978-0-8194-8961-6

Type

conf

DOI

10.1117/12.905827

Filename

6210931