Open AccessElectronic structure and photoluminescence properties of Ca2GeO4 ∶Eu3+ in ultraviolet and vacuum ultraviolet region
Author(s) -
秦青松,
于明汇,
周宏亮,
周美娇,
项晓天,
李晓的,
曾俊玺,
张加驰
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.067802
Subject(s) - photoluminescence , phosphor , ultraviolet , excited state , materials science , density functional theory , vacuum ultraviolet , optoelectronics , excitation , photoluminescence excitation , ion , diode , ultraviolet light , atomic physics , molecular physics , physics , chemistry , computational chemistry , quantum mechanics
Red emitting Ca2GeO4 ∶Eu3+ phosphors are synthesized by solid state method. The ultraviolet and vacuum ultraviolet excited photoluminescence properties are investigated in detail. The phenomenon of reduction of Eu3+ ions in air and the color switches are discovered and explained. The Ca2GeO4 ∶Eu3+ presents intense excitation intensities at 163—230, 301 and 466 nm, showing the potential applications in plasma display panels and light emitting diodes. The excitation spectra are studied to identify the photoluminescence mechanism of Ca2GeO4 ∶Eu3+ . First principles calculation within the local density approximation of the density functional theory is used to calculate the electronic structure and the linear optical properties of Ca2GeO4.