Luminescence and Raman studies of YNbO4 phosphors doped by Eu3+, Ga3+, and Al3+

Abstract

Efficient phosphors based on YNbO4 and doped by Eu3+, Ga3+, and Al3+ were synthesized with different fluxes under different thermal conditions and investigated under x-ray excitation and Raman spectroscopy. The samples codoped by Al3+ and Ga3+ show higher intensity under x-ray excitation in comparison with YNbO4:Eu3+ phosphors. The model of redistribution energy transfer from D51 level to F7J is proposed. Monoclinic fergusonite crystal structure and excellent luminescent properties under x-ray excitation allow recommend these phosphors as good candidates for different applications.

Considerable photoluminescence enhancement of LiEu(MoO4)2 red phosphors via Bi and/or Si doping for white LEDs

“…In view of the analysis of Raman vibration mode on scheelite type molybdate by Hanuza, [22] the specific vibration mode is shown in the following type:…”

Photoluminescence properties of Y0.5−xGd0.35Eu0.15BixNbO4 (0≤x≤0.30) and Y0.35Gd0.35Eu0.15Bi0.15Nb1−yPyO4 (0≤y≤0.20) phosphors

“…The photoluminescence properties of YNbO 4 activated by the ions Eu 3+ , Sm 3+ , and Er 3+ etc. have been reported [9,10]. Recently, Sung et al reported that the co-doping of Gd 3+ and Eu 3+ on the YNbO 4 phosphor dramatically enhances the luminance intensity due to the energy migration process like Gd 3+ !…”

Низкотемпературный синтез стеклокерамики с кристаллитами YNbO-=SUB=-4-=/SUB=- : Eu-=SUP=-3+-=/SUP=-

“…Ниобат иттрия, активированный редкими землями, является перспективным радиационно-стойким сцинтиллятором, в частности рентгенолюминофором. Такие материалы могут использоваться в медицинской и промышленной рентгенографии [1,2]. Ниобат иттрия обладает высокой плотностью, что немаловажно при поглощении и преобразовании ионизирующего излучения в видимый свет, не гигроскопичен, а также обладает высокой радиационной и химической стойкостью.…”