Tailoring of deep-red luminescence in Ca2SiO4:Eu(2+)

Yasushi Sato; Hideki Kato; Makoto Kobayashi; Takaki Masaki; Dae-Ho Yoon; Masato Kakihana

doi:10.1002/anie.201402520

Tailoring of deep-red luminescence in Ca2SiO4:Eu(2+)

Angew Chem Int Ed Engl. 2014 Jul 21;53(30):7756-9. doi: 10.1002/anie.201402520. Epub 2014 Jun 10.

Authors

Yasushi Sato¹, Hideki Kato, Makoto Kobayashi, Takaki Masaki, Dae-Ho Yoon, Masato Kakihana

Affiliation

¹ Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan); Present address: Department of Chemistry, Faculty of Science, Okayama University of Science, Okayama 700-0005 (Japan). satoy@tagen.tohoku.ac.jp.

PMID: 24916117
DOI: 10.1002/anie.201402520

Abstract

We report a new dicalcium silicate phosphor, Ca(2-x)Eu(x)SiO4, which emits red light in response to blue-light excitation. When excited at 450 nm, deep-red emission at 650 nm was clearly observed in Ca1.2Eu0.8SiO4, the external and internal quantum efficiencies of which were 44 % and 50 %, respectively. The red emission from Ca(2-x)Eu(x)SiO4 was strongly related to the peculiar coordination environments of Eu(2+) in two types of Ca sites. The red-emitting Ca2SiO4:Eu(2+) phosphors are promising materials for next-generation, white-light-emitting diode applications.

Keywords: crystal-site engineering; lanthanides; luminescence; phosphors; silicates.