Abnormal reduction of Eu ions and luminescence in CaB2O4: Eu thin films

Jianhua Hao, J. Gao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

59 Citations (Scopus)


Thin films of CaB2O4: Eu were deposited on glass substrates by spray pyrolysis. The abnormal reduction of Eu3+to Eu2+in as-grown thin films was found at the growth temperatures from 300 to 500°C. Blue cathodoluminescence was observed by annealing films in air, correlating with further abnormal reduction of Eu ions and crystallization of compounds. These phenomena were explained by an electron transfer mechanism. The chromaticity coordinates were x=0.193 and y =0.089 with a dominant wavelength of 455 nm. Our results indicate calcium borate doped with Eu is a blue phosphor at temperatures suitable for the use of glass substrates in flat panel applications.
Original languageEnglish
Pages (from-to)3720-3722
Number of pages3
JournalApplied Physics Letters
Issue number17
Publication statusPublished - 25 Oct 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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