Luminescence of undoped and Eu³⁺ doped nanocrystalline SrWO₄ scheelite: time resolved fluorescence complimented by DFT and positron annihilation spectroscopic studies

Abstract

Effect of annealing temperature on photophysical characteristics of pure and SrWO4:Eu3+ nanoparticles were investigated and the changes observed correlated with density function theory (DFT) and positron annihilation lifetime spectroscopy (PALS).

Revealing the oxidation number and local coordination of uranium in Nd 2 Zr 2 O 7 pyrochlore: A photoluminescence study

“…Initial increase in decay time and emission intensity can be attributed to reduction in non-radiative mode of relaxation as a result of decreased defect concentration with increase in annealing temperature upto 1000°C [29,30]. Saturation at 1000°C in luminescence lifetime value is because there is no change in defect concentration beyond 1000°C.…”

Can europium atoms form luminescent centres in diamond: A combined theoretical–experimental study

“…Luminescent Eu is used in inorganic scintillators, but also wide band gap semiconductors such as ZnO. [24][25][26][27][28][29][30] The high quantum efficiency and long photoluminescence decay times of RE elements (milliseconds, compared to nanoseconds for NV, SiV, or GeV) makes them very interesting color centres for quantum memory and repeater applications. Also in case of diamond, lan-thanides are receiving attention as possible luminescent centres.…”

Low temperature micro Raman and laser induced upconversion and downconversion spectra of europium doped silver tungstate Ag2−3xEuxWO4 nanorods

“…Considering the doping sites, characteristics such as distance between dopants, coordinate numbers, relative spatial position and electrical environments are also important in order to fully understand the photoluminescence properties [17]. Many tungstate lattices when acting as hosts for Eu 3? activators have been shown to manifest excellent luminescent efficiency and color purity as well as having high average refractive indexes [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Also this class of tungsten oxides can be considered as ideal host lattices for dopants as they possess high thermal, chemical and physical stability and in addition they can often be synthesized at low temperatures.…”

“…Recently, many Eu 3? -doped tungstate based lattices (as host for the Eu 3? activators that emit the red light) have been reported for possible application as red conversion phosphors examples include CdWO 4 [2,3], SrWO 4 [4,5], Y 6 WO 12 [6], KLa(WO 4 ) 2 [7], RbGd(WO 4 ) 2 [8], NaY(WO 4 ) 2 [9], NaGd(WO 4 ) 2 [10], Na 2 Dy 4 (WO 4 ) 7 [11], La 2 W 2 O 9 [12], ZnWO 4 [13], Ba 4 Na 2 W 2 O 11 [14], MgWO 4 [15], and Li 2 Mg 2 (WO 4 ) 3 [16]. Some of these materials require high amounts of the expensive europium activator.…”