An Improved Slurry Method of Self-Adaptive Phosphor Coating for White pc-LED Packaging

Author

Haibo Rao ; Wei Wang ; Xianlong Wan ; Linsong Zhou ; Junyuan Liao ; Da Zhou ; Qiaolin Lei ; Xuemei Wang

Author_Institution

Sch. of Opto-Electron. Inf., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

9

Issue

6

fYear

2013

fDate

Jun-13

Firstpage

453

Lastpage

458

Abstract

For illumination-grade applications, the spatial homogeneity of the white light emitted is an important issue which is directly associated with the geometry and the composition of the color conversion layer in phosphor-converted LEDs. In order to create a phosphor coating of high quality surrounding the LED chip surface, an improved slurry method with self-exposure technique was applied and investigated. The conformal phosphor layer of self-adaptability to angular intensity distribution of LED emitting light was realized. Plasma treatment was introduced to improve the aging performance of white LEDs with this advanced slurry method. The effect of the self-adaptive coating on the improvement of angular color uniformity of white LEDs was measured and discussed.

Keywords

ageing; colour; electronics packaging; light emitting diodes; optical films; phosphors; plasma materials processing; LED chip surface; aging performance; angular color uniformity; angular intensity distribution; color conversion layer; conformal phosphor layer; illumination-grade applications; phosphor-converted LED; plasma treatment; self-adaptive phosphor coating; self-exposure technique; slurry method; spatial homogeneity; white light emission; white pc-LED packaging; Coatings; Image color analysis; Light emitting diodes; Phosphors; Plasmas; Resists; Slurries; Coatings; light-emitting diodes; lighting; packaging;

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2012.2226017

Filename

6418057