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

Research output: Contribution to journalArticle

101 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
Externally publishedYes

Fingerprint

Phosphors
phosphors
Light emitting diodes
light emitting diodes
Quantum efficiency
quantum efficiency
Quenching
quenching
retaining
luminance
wurtzite
Powders
Light sources
Luminescence
Luminance
light sources
purity
Thermodynamic properties
solubility
Solubility

ASJC Scopus subject areas

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

Cite this

Highly efficient and thermally stable blue-emitting AlN : Eu2+ phosphor for ultraviolet white light-emitting diodes. / Inoue, Kazuo; Hirosaki, Naoto; Xie, Rong Jun; Takeda, Takashi.

In: Journal of Physical Chemistry C, Vol. 113, No. 21, 28.05.2009, p. 9392-9397.

Research output: Contribution to journalArticle

Inoue, Kazuo ; Hirosaki, Naoto ; Xie, Rong Jun ; Takeda, Takashi. / Highly efficient and thermally stable blue-emitting AlN : Eu2+ phosphor for ultraviolet white light-emitting diodes. In: Journal of Physical Chemistry C. 2009 ; Vol. 113, No. 21. pp. 9392-9397.
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