Citric based sol–gel synthesis and luminescence characteristics of CaLa2ZnO5:Eu3+phosphors for blue LED excited white LEDs

► We had synthesized a novel class of orange–red phosphors namely Eu3+:CaLa2ZnO5 phosphor. ► Eu3+:CaLa2ZnO5 is having CIE coordinates nearer to NTSC recommendations for a red phosphor. ► It could be excited efficiently with the GaN based blue light-emitting diode (LED) chip. A novel class of orange–...

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Bibliographic Details
Published in:Journal of alloys and compounds 2012-01, Vol.512 (1), p.264-269
Main Authors: Bandi, Vengala Rao, Grandhe, Bhaskar Kumar, Jang, Kiwan, Lee, Ho-Sueb, Shin, Dong-Soo, Yi, Soung-Soo, Jeong, Jung-Hyun
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Emission
Emission analysis
Exact sciences and technology
Excitation
Light-emitting diodes
Luminescence
Optical properties
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Other solid inorganic materials
Oxide materials
Phosphors
Photoluminescence
Physics
Sol–gel processes
White light
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Summary:► We had synthesized a novel class of orange–red phosphors namely Eu3+:CaLa2ZnO5 phosphor. ► Eu3+:CaLa2ZnO5 is having CIE coordinates nearer to NTSC recommendations for a red phosphor. ► It could be excited efficiently with the GaN based blue light-emitting diode (LED) chip. A novel class of orange–red phosphors namely CaLa2ZnO5 (CLZ) doped with Eu3+ ions were prepared by adopting citrate based sol–gel method. Those were thoroughly characterized by means of XRD, SEM, Tg-DTA, photoluminescent (PL) spectral profiles. PL studies reveal that its emission intensity strongly depends on sintering temperature as well as the dopant ion (Eu3+) concentration. Eu3+ ion doped CaLa2ZnO5 phosphor has a strong excitation at 468nm, which correspond to the popular emission line from a GaN based blue light-emitting diode (LED) chip. The influence of the preparation method on the luminescence property was studied by comparing the emission performance of phosphors prepared by sol–gel and solid-state reaction methods along with a commercial red phosphor Y2O2S:Eu3+. Thus, the intense red emission (5D0→7F2) of the Eu3+ doped CLZ phosphors under blue excitation suggests them to be a potential candidate for the production of white light by blue LEDs.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2011.09.078