Near UV-Blue excitable green-emitting nanocrystalline oxide

G. A. Hirata, C. E. Rodríguez-García, N. Perea-Lpez

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Green-emitting Eu-activated powders were produced by a two-stage method consisting of pressure-assisted combustion synthesis and postannealing in ammonia. The as-synthesized powders exhibited a red photoluminescence (PL) peak located at λ = 616 nm when excited with λ = 395 nm UV. This emission peak corresponds to the 5D0→ 7F2 transition in Eu3+. After annealing in ammonia, the PL emission changed to an intense broad-band peak centered at λ = 500 nm, most likely produced by 4f65d1→4f7 electronic transitions in Eu2+. This green-emitting phosphor has excitation band in the near UV-blue region (λ = 300 -450nm). X-ray diffraction analysis reveals mainly the orthorhombic EuAlO3 and Al2O3 phases. Transmission electron microscopy observations showed that the grains are formed by faceted nanocrystals (~4nm) of polygonal shape. The excellent excitation and emission properties make these powders very promising to be used as phosphors in UV solid-state diodes coupled to activate white-emitting lamps.

Original languageEnglish (US)
Article number790517
JournalAdvances in Materials Science and Engineering
Volume2011
DOIs
StatePublished - Sep 16 2011

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

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