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Daicho, H., Iwasaki, T., Enomoto, K., Sasaki, Y., Maeno, Y., Shinomiya, Y., Aoyagi, S., Nishibori, E., Sakata, M., Sawa, H., Matsuishi, S. and Hosono, H. (2012) A Novel Phosphor for Glareless White Light-Emitting Diodes. Nature Communications, 3, Article ID: 1132.

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• TITLE: Large Redshifts in Emission and Excitation from Eu2+-Activated Sr2SiO4 and Ba2SiO4 Phosphors Induced by Controlling Eu2+ Occupancy on the Basis on Crystal-Site Engineering

  AUTHORS: Yasushi Sato, Hiroki Kuwahara, Hideki Kato, Makoto Kobayashi, Takaki Masaki, Masato Kakihana

  KEYWORDS: Photoluminescence, Red-Emitting Phosphors, Green-Emitting Phosphors, Orthosilicates, Crystal-Site Engineering

  JOURNAL NAME: Optics and Photonics Journal, Vol.5 No.11, November 25, 2015

  ABSTRACT: The photoluminescence properties of Eu2+-activated α’-Sr2SiO4 and α’-Ba2SiO4 with a high Eu2+ concentration were investigated. In the case of Sr2-xEuxSiO4, emission was shifted from 585 to 611 nm with increasing the total Eu2+ concentration (x) from 0.1 to 0.8. This trend was similar to that in Ba2-xEuxSiO4, where the emission was shifted from 513 to 545 nm. The large redshifts in both the excitation and emission spectra were discussed in terms of the Eu2+ occupancies on two kinds of M sites and their local structural changes (M: Sr and Ba).