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Single‐Composition Trichromatic White‐Emitting Ca 9 MgNa(PO 4 ) 7 :Ce 3+ /Tb 3+ /Mn 2+ Phosphors – Soft Chemical Synthesis, Luminescence, and Energy‐Transfer Properties
Author(s) -
Zhang Yang,
Geng Dongling,
Shang Mengmeng,
Wu Yuan,
Li Xuejiao,
Lian Hongzhou,
Cheng Ziyong,
Lin Jun
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201300430
Subject(s) - chromaticity , phosphor , cathodoluminescence , photoluminescence , analytical chemistry (journal) , chemistry , luminescence , scanning electron microscope , transmission electron microscopy , materials science , optics , optoelectronics , nanotechnology , physics , chromatography
Ce 3+ ‐, Tb 3+ ‐, and Mn 2+ ‐activated Ca 9 MgNa(PO 4 ) 7 (CMNP) phosphors have been prepared by a Pechini‐type sol–gel method. X‐ray diffraction (XRD), field‐emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM), and photoluminescence (PL) and cathodoluminescence (CL) spectroscopy were used to characterize the samples. The energy transfer from Ce 3+ to Tb 3+ in CMNP phosphors has been demonstrated to be a resonant type by a dipole–quadrupole mechanism, and the Ce 3+ to Tb 3+ critical distances ( R C ) calculated by the concentration‐quenching method and the spectral‐overlap method are 12.21 and 12.11 Å, respectively. A color‐tunable emission in CMNP phosphors can be realized by Ce 3+ →Tb 3+ or Ce 3+ →Mn 2+ energy transfer. White cathodoluminescence has been realized in a single‐phase Ca 9 MgNa(PO 4 ) 7 host by codoping with Ce 3+ , Tb 3+ , and Mn 2+ for the first time with International Commission on Illumination (CIE) chromaticity coordinates (0.319, 0.327). Furthermore, the cathodoluminescence (CL) properties of CMNP:Ce 3+ /Tb 3+ /Mn 2+ phosphors, including the dependence of the CL intensity on accelerating voltage and filament current, the decay behavior of CL intensity under electron bombardment, and the stability of the CIE chromaticity coordinates, have been investigated in detail. Owing to their good CL properties and good CIE chromaticity coordinates, the as‐prepared phosphors have potential application in field emission display (FED) devices.