Luminescence of Pr3+ ions in Y3Al5?xGaxO12 solid solutions

Effect of oxidation annealing on optical properties of YAG:Ce single crystals

“…The authors showed that the near-UV band is splitted into a high-energy band with the center around 4.9 eV related to the self-trapped excitons (STE), and into a low-energy band with the center around 4.2 eV connected with the self-trapped holes (STH) probably at oxygen ions. However, Zorenko et al observed YAG crystals with different concentrations of the AD and suggested that the low-energy band has not STH origin, but is caused rather by recombination of free electrons with holes localized at the AD [22][23][24]. Other studies agreed that the near-UV emission is due to exciton localized around the AD [25][26][27][28][29].…”

Bi3+–Pr3+ energy transfer processes and luminescent properties of LuAG:Bi,Pr and YAG:Bi,Pr single crystalline films

“…The excitation bands peaked at 7.0 and 7.23 eV as well as at 6.995 eV and 7.14-7.8 eV in the range of fundamental absorption edge of LuAG and YAG hosts can correspond to formation of excitons bound with the Bi 3+ and Pr 3+ ions, respectively. Peaks around 8.2 eV and 8.0 are related to onset of interband transitions in LuAG and YAG hosts, respetively [16,17].…”

“…The Pr-doped YAG and LuAG-based scintillators can be prepared both in the form of bulk single crystals (SC) by the Czochralski or Bridgman methods [1][2][3][4][5][6][7][8] as well as in the form of single crystalline films (SCF) by the Liquid Phase Epitaxy (LPE) method with a typical thickness of 2-60 m [9][10][11][12]. Apart from the traditional scintillation applications for environmental radiation monitoring and positron emission tomography (PET) [3,4,7,8], they can be employed also for imaging screens with high spatial resolution [9,[13][14][15][16] with some advantages with respect to typical powder phosphor-based screens [17]. Specifically, due to location of the emission spectra of LuAG:Pr and YAG:Pr SCF in the UV range, the spatial resolution R of screens can be improved with respect to the Ce doped LuAG and YAG SCF based scintillating screens emitting in the visible range, according to the formula R~0.61* /NA (1), where  is the emission wavelength, NA is the numerical aperture of the optics [9,10,15,16].…”

Single-crystalline films of Ce-doped YAG and LuAG phosphors: advantages over bulk crystals analogues

“…The main peculiarity of spectral-kinetic characteristics of SCF based on YAG:Ce and LuAG:Ce is determined by the extremely low concentration of Y Al 3+ and Lu Al 3+ antisite defects (AD) (part of Y and Lu ions substituted the octahedral-coordinated sites of Al ions in the garnet lattice) [15][16][17][18][19]. However, in the single crystals (SC) of these garnets obtained by crystallization from the melt at significantly higher temperatures (1800-1900 1C) than at the LPE growth procedure (850-1100 1C), the concentration of AD reaches the value of 0.2-0.5 at% [20][21][22].…”