Preparation of Ca2Si5N8:Eu2+, Tm3+ phosphor by calcium hydride and its afterglow properties

Bingfu Lei, Ken Ichi Machida, Takashi Horikawa, Hiromasa Hanzawa

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Citations (Scopus)

Abstract

Reddish-orange emitting long-lasting phosphorescence phosphor Ca 2Si5N8:Eu2+,Tm3+ has been prepared by solid-state reaction method using cheaper CaH2 as calcium source. Upon UV light excitation, Ca2Si5N 8:Eu2+,Tm3+ phosphor gave a broad band emission peaking at ca. 600 nm. Furthermore, after irradiation by the UV or visible light (in the range of 250-400 nm) for 3 min, the same colored intense afterglow based on the 4f65d1→4f7 transition of Eu2+ ion was observed on the phosphor codoped with 0.5 at% of Eu 2+ and Tm3+ ions, and its afterglow can be seen with the naked eye in the dark clearly for more than 1 h after removal of the excitation source. The afterglow decay curve contained fast decay and slow decay components. The substitution of Mg2+ to Ca2+ ions or addition of excessive Ca2+ ions into the phosphor matrix to modify the defect environment were effective to improve the afterglow properties.

Original languageEnglish
Title of host publication2nd International Conference on Smart Materials and Nanotechnology in Engineering
DOIs
Publication statusPublished - 2009
Event2nd International Conference on Smart Materials and Nanotechnology in Engineering - Weihai, China
Duration: 2009 Jul 82009 Jul 11

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7493
ISSN (Print)0277-786X

Conference

Conference2nd International Conference on Smart Materials and Nanotechnology in Engineering
Country/TerritoryChina
CityWeihai
Period09/7/809/7/11

Keywords

  • Afterglow
  • CaSiN:Eu
  • Calcium Hydride
  • Defect
  • Phosphor

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