화학공학소재연구정보센터
Materials Research Bulletin, Vol.90, 66-72, 2017
Synthesis and luminescent properties of KGd(MoO4)(2):Sm3+ red phosphor for white light emitting diodes
The red-emitting phosphors of Sm3+ ions doped KGd(MoO4)(2) were synthesized by a high temperature solid state reaction method. The X-ray diffraction patterns confirmed that the principal crystalline phase of the sample was KGd(MoO4)(2). The photoluminescence (PL) excitation spectra of KGd(MoO4)(2):Sm3+ showed a series of absorption peaks in the range of 300-500 nm and the strongest excitation peak at 406 nm due to H-6(5/2)-> F-4(7/2) transition of Sm3+. The PL spectrum indicated that the optimum dopant concentration of Sm3+ ion is 0.06. The critical transfer distance of Sm3+ ions was 17.65 angstrom and the quenching mechanism of KGd(MoO4)(2):Sm3+ determined electric dipole-dipole interaction. The CIE chromaticity coordinates of the KGd(MoO4)(2):0.06Sm(3+) phosphor was located in the red region. All decay curves well fitted by the double exponential function, and average lifetimes for the (4)G(5/2) excited level of Sm3+ in the KGd(MoO4)2 was in the submicrosecond. And the quantum efficiency was determined to be 28.5%. (C) 2017 Elsevier Ltd. All rights reserved.