Highly efficient and thermally stable blue-emitting AlN:Eu2+ phosphor for ultraviolet white light-emitting diodes

Kazuo Inoue, Naoto Hirosaki, Rong Jun Xie, Takashi Takeda

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106 Citations (Scopus)

Abstract

An Eu2+-activated AlN phosphor was synthesized by firing the powder mixture of AlN, R-Si3N4, and Eu2O 3at 1500-2050 °C for 4 h under 1.0 MPa N2. The phase purity, photoluminescent properties, thermal quenching, and quantum efficiency of the fired samples were investigated. A single AlN wurtzite phase was formed at low doping concentrations of Eu2+ (≤ 0.1 mol %) and Si (≤ 2.2 mol %). The introduction of Si is essential for the solubility of Eu 2+ in the AlN lattice. Intense blue luminescence with a peak emission wavelength of 465 nm was observed in AlN:Eu2+, when Si was doped simultaneously. This blue phosphor shows a small thermal quenching, retaining the luminance of 90% at 150 °C. The absorption and external quantum efficiencies of AlN:Eu2+ are 63%μ and 46% upon 365 nm excitation, respectively. These results indicate that AlN:Eu2+ has great potential as a blue phosphor for white light-emitting diodes (LEDs) utilizing UV chips as the light source.

Original languageEnglish
Pages (from-to)9392-9397
Number of pages6
JournalJournal of Physical Chemistry C
Volume113
Issue number21
DOIs
Publication statusPublished - 2009 May 28

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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