Improving the Angular Color Uniformity of Hybrid Phosphor Structures in White Light-Emitting Diodes

Author

Kuo-Ju Chen ; Hau-Vei Han ; Bing-Cheng Lin ; Hsin-Chu Chen ; Min-Hsiung Shih ; Shih-Hsuan Chien ; Kuan Yu Wang ; Hsin-Han Tsai ; Peichen Yu ; Po-Tsung Lee ; Chien-Chung Lin ; Hao-Chung Kuo

Author_Institution

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

Volume

34

Issue

10

fYear

2013

fDate

Oct. 2013

Firstpage

1280

Lastpage

1282

Abstract

This letter examines a hybrid phosphor structure for white light-emitting diodes. The hybrid phosphor structure produces more efficient luminosity and more uniform angular correlated color temperature (CCT) than the conventional dispensing method. The experimental results show that the CCT deviation improved from 453 to 280 K between -70° and 70 °. This was likely caused by the large blue light divergent angle. The lumen output produced was higher than that produced by dispense and conformal phosphor structures. Therefore, the results show that the hybrid phosphor structure can be used in solid-state lighting.

Keywords

colour; light emitting diodes; phosphors; P; blue light divergent angle; lumen output; solid-state lighting; temperature -70 degC to 70 degC; temperature 453 K to 280 K; uniform angular CCT; uniform angular correlated color temperature; white light-emitting diodes; Backscatter; Color; Light emitting diodes; Packaging; Phosphors; Photonics; Solid state lighting; Color distribution; light-emitting diodes (LEDs); packaging; phosphor;

fLanguage

English

Journal_Title

Electron Device Letters, IEEE

Publisher

ieee

ISSN

0741-3106

Type

jour

DOI

10.1109/LED.2013.2278336

Filename

6594804