Circadian Light Source Based on K x Na 1-x LuS 2 :Eu 2+ Phosphor

The presented work describes a functional demonstration device representing the source of white light with tunable color correlated temperature. Tunability is achieved by using two different kinds of excitation diodes (nearUV and blue) in combination with a proper KxNa1-xLuS2:Eu2+ phosphor. Its lumi...

Full description

Saved in:
Bibliographic Details
Published inECS journal of solid state science and technology Vol. 7; no. 1; pp. R3182 - R3188
Main Authors Jarý, Vítězslav, Havlák, Lubomír, Bárta, Jan, Rejman, Martin, Bystřický, Aleš, Dujardin, Christophe, Ledoux, Gilles, Nikl, Martin
Format Journal Article
LanguageEnglish
Published IOP Science 2018
Subjects
Chemical Sciences
Material chemistry
Online AccessGet full text

Cover

More Information
Summary:The presented work describes a functional demonstration device representing the source of white light with tunable color correlated temperature. Tunability is achieved by using two different kinds of excitation diodes (nearUV and blue) in combination with a proper KxNa1-xLuS2:Eu2+ phosphor. Its luminescence due to the Eu2+ 5d–4f allowed transition covers a broad emission region in visible range under both nearUV and blue excitations. The possibility to change the intensity ratio of the excitation diodes yields the changes of the output color correlated temperature. These changes are clearly demonstrated by shifts in the CIE color space; light quality is also quantified and discussed using CRI (color rendering index) and CQS (color quality scale) metrics.
ISSN:2162-8769
2162-8777
DOI:10.1149/2.0231801jss