Blue-emitting Eu2+-doped CaAl2O4 phosphor thin films prepared using pulsed laser deposition technique with post annealing

Takashi Tanii, Tomomi Goto, Tomoyuki Iida, Meishoku Koh-Masahara, Iwao Ohdomari

Research output: Contribution to journalLetter

6 Citations (Scopus)

Abstract

Blue-emitting Eu2+-doped calcium aluminate phosphor thin films were obtained using the pulsed laser deposition technique with post annealing. As-deposited films were amorphous and showed weak red Eu3+ photoluminescence (PL). By annealing in reducing atmosphere (N2/H2:2% mixed gas) at 950°C for 3 h, the film was crystallized and showed a PL emission band peaking at about 447 nm, which originated from the 4f65d to 4f7 transition of Eu2+ ion. It is considered that the deposited film consists mainly of CaAl2O4 and partly of other binary compounds of the CaO-Al2O3 system. It was determined that the PL intensity of Eu2+ in CaAl2O4 can be controlled by the laser fluence, target-substrate distance and injection gas.

Original languageEnglish
Pages (from-to)L1126-L1128
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume40
Issue number10 B
Publication statusPublished - 2001 Oct 15

Keywords

  • Complex oxide
  • Flat panel display
  • PLD
  • Phosphor thin film

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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