Effects of Volume Scattering Diffusers on the Color Variation of White Light LEDs

Author

Shih-Hsin Ma ; Liang-Shiun Chen ; Wen-chao Huang

Author_Institution

Dept. of Photonics, Feng Chia Univ., Taichung, Taiwan

Volume

11

Issue

1

fYear

2015

fDate

Jan. 2015

Firstpage

13

Lastpage

21

Abstract

This study analyzed the variation of the correlated color temperature (CCT) of white light, which was emitted from Lambertian-type LEDs, and passed through a volume scattering diffuser (VSD). The tested VSD, fabricated by mixing scattering particles (PMMA) in glue (epoxy), exhibited various concentration weights of the scattering particles. Measurements showed that the CCT values decreased and the CCT variations exhibited oscillatory behavior, as the concentration of scattering particles increased. Furthermore, the results regarding CCT variation demonstrated that a higher CCT source is more sensitive to the concentration than a lower CCT source is, suggesting that the power loss of shorter-wavelength light is greater than that of longer-wavelength light, when the light passes through a VSD.

Keywords

light emitting diodes; light scattering; Lambertian-type LED; color variation; correlated color temperature; glue; mixing scattering particles; oscillatory behavior; power loss; scattering particle concentration; volume scattering diffusers; white light LED; Absorption; Color; Image color analysis; Light emitting diodes; Light sources; Lighting; Scattering; Correlated color temperature (CCT); LEDs; volume scattering diffuser (VSD); white light;

fLanguage

English

Journal_Title

Display Technology, Journal of

Publisher

ieee

ISSN

1551-319X

Type

jour

DOI

10.1109/JDT.2014.2354434

Filename

6891103