Synthesis of self-assembled micro flowers of (Na_(0.5)La_(0.5))MoO_4:Eu~(3+) phosphor and it's photometric properties

摘要

Self-assembled flowers of (Na0.5La0.5)MoO4:Eu3+ with many petals have been successfully synthesized by using the Ethylenediaminetetraacetic acid mediated hydrothermal route. X-ray diffraction patterns(XRD) indicated that (Na0.5La0.5)MoO4:Eu3+ crystallized into a scheelite tetragonal structure with the space group I4(1)/a. A significant spectral blue shift was observed when the Eu3+ doping concentration increased from 2 mol% to 10 mol%. Upon 395 nm excitation, the flower-like (Na0.5La0.5)MoO4:Eu3+ structures showed a strong emission in the red region due to the characteristic D-5(0)- F-7(2) transition of Eu3+. The effect of doping content of Eu3+ (2, 4, 6, 8, 10 mol%) on the luminescence properties of (Na0.5La0.5) MoO4 have been reported. To check the color purity and emission quality of the phosphors, photometric parameters were investigated. The percentage of luminous efficiency of as-synthesized micro flowers was found to be 43%, which has the potential to be used in phosphor converted light emitting diodes (LED). (C) 2019 Elsevier B.V. All rights reserved.