Combinatorial synthesis and luminescent characteristics of RECa 4 O(BO 3 ) 3 epitaxial thin films

H. Kubota, R. Takahashi, T. W. Kim, T. Kawazoe, M. Ohtsu, N. Arai, M. Yoshimura, H. Nakao, H. Furuya, Y. Mori, T. Sasaki, Y. Matsumoto, H. Koinuma

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

A series of RECa 4 O(BO 3 ) 3 (RECOB) thin films (RE = Rare earth elements) was fabricated on ultrasmooth GdCOB (0 1 0) substrates by laser molecular beam epitaxy (MBE) method to explore the optimal growth conditions and to evaluate the luminescent properties. The growing surface of the film on a temperature gradient substrate was diagnosed with scanning reflection high energy electron diffraction (S-RHEED) system for quickly specifying optimum growth temperature and its dependence of rare earth element. The lowest temperature for epitaxial film growth was defined by the appearance of streak pattern in RHEED and it reflected the lattice matching with the substrate. TbCOB and EuCOB emitted respectively very bright green (543nm) and red (611nm) light, indicating that they are promising new phosphors. It is noteworthy that we could detect a remarkably strong red emitting region in the EuCOB-ScCOB-PrCOB ternary composition spread library.

Original languageEnglish
Pages (from-to)241-244
Number of pages4
JournalApplied Surface Science
Volume223
Issue number1-3
DOIs
Publication statusPublished - 2004 Feb 15
Externally publishedYes

Keywords

  • Combinatorial
  • Laser MBE
  • NLO thin film
  • Phosphor
  • RECOB

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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