An Investigation of the Optical Analysis in White Light-Emitting Diodes With Conformal and Remote Phosphor Structure

Author

Kuo-Ju Chen ; Hsin-Chu Chen ; Chien-Chung Lin ; Chao-Hsun Wang ; Chia-Chi Yeh ; Hsin-Han Tsai ; Shih-Hsuan Chien ; Min-Hsiung Shih ; Hao-Chung Kuo

Author_Institution

Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu, Taiwan

Volume

9

Issue

11

fYear

2013

fDate

Nov. 2013

Firstpage

915

Lastpage

920

Abstract

An effective emission model of phosphor film is proposed by using bidirectional scattering distribution function system (BSDF), and the model is verified by white light-emitting diodes (LEDs) with conformal and remote phosphor structure. The emission model is built to clarify the optical characteristics by analyzing the angular-dependent distribution of emission and excitation behaviors in phosphor film. The white LEDs with conformal and remote phosphor structure are also fabricated for experimental comparison. The uniformity of angular correlated color temperature (CCT) in white LEDs can be determined by the angular distribution of blue and yellow light, which is in turns decided by the refractive index variation between chip a©nd phosphor layers. Finally, the experimental results are found to have good agreement with the simulation results performing by the Monte Carlo method.

Keywords

Monte Carlo methods; light emitting diodes; optical testing; phosphors; Monte Carlo method; angular correlated color temperature; bidirectional scattering distribution function system; emission model; optical analysis; optical characteristics; phosphor film; remote phosphor structure; white light-emitting diodes; Light emitting diodes; Optical films; Phosphors; Photonics; Refractive index; Scattering; GaN; light-emitting diodes (LEDs); optical simulation; phosphor;

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2013.2272644

Filename

6556941