Title :
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
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;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2013.2278336
