Journal
JOURNAL OF LUMINESCENCE
Volume 205, Issue -, Pages 115-121Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2018.09.010
Keywords
Rare-earth ions; White LEDs; Luminescence; Eu3+; Red phosphors; Optical properties
Categories
Funding
- National Natural Science Foundation of China [51502190]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2017-skllmd-01]
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Red-emitting Ca3Y(AlO)(3)(BO3)(4):Eu3+ (abbreviated as CYAB:Eu3+) phosphors with different Eu (3+) doping concentrations were synthesized by a conventional solid-state method and their crystal structure, morphology, luminescence properties, decay curves and quantum efficiency were investigated in detail. The CYAB:Eu3+ phosphors can emit red light peaking at similar to 621 nm under 397 nm excitation and the most intense red emission was obtained at the Eu3+ concentration of 50 mol%. From the concentration-dependent photoluminescence studies of CYAB:Eu3+ phosphors, the concentration quenching mechanism was dominated by dipole-dipole interaction. The as-prepared CYAB:0.5Eu(3+) sample possessed good color coordinates of (0.653, 0.342) with high color purity of 90%. More importantly, the internal quantum efficiency of CYAB:0.5Eu(3+) sample reached up to 88%. Furthermore, CYAB:Eu3+ exhibited good thermal stability and its emission intensity at 150 degrees C was still up to 76.3% of that at room-temperature. In addition, a prototype LED device was fabricated by coating a phosphor blend of BaMgAl10O7:Eu2+ blue phosphors, (Ba,Sr)(2) SiO4:Eu(2+ )green phosphors and CYAB:0.5Eu(3+) red phosphors on the surface of 395 nm-emitting InGaN chip, which exhibited bright white light under 120 mA driven current. These good results indicate that the CYAB:Eu3+ phosphors are very appropriate red-emitting phosphors for applications in near-ultraviolet-excited white light-emitting diodes.
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