Luminescence and defect studies of YAlO3:Dy3+, Sm3+ single crystals exposed to 100 MeV Si7+ ion beam

Structural and optical properties of beta irradiated YAlO3 single crystals

“…There are a few reports available in literature from experimental and theoretical calculations on the electronic structure and the nature of charge trapping behavior of lanthanide atoms in RE aluminum perovskite (REAlO3) compounds [10,16,18,31]. For example, the trivalent RE atoms such as Nd, Dy, Ho, Er, Tm, Sm, Eu behave as electron traps, while other trivalent atoms such as Ce, Tb and Pr act as hole traps in wide bandgap materials [5].…”

“…TL response is attributed to the oxygen vacancy related to F and F+ color centers and YAl 3+ antisite defects [7]. Further, the undoped single crystal irradiated with 100 MeV Si 7+ ions exhibit two completely overlapped glow curves at 232 and 328 C which are attributed to the oxygen vacancies and other point defects, such as YAl 3+ and AlY 3+ antisite defects [18]. Furthermore, the effect of shallow traps in undoped YAP is also studied by low temperature TL which displays seven glow curves originating from intrinsic defects that traps holes during X-ray irradiation [17].…”

“…The RE or TM dopants in YAP introduce several energy levels within the forbidden bandgap and these energy levels manifest as a characteristic optical emission or absorption under suitable external stimulation which is being effectively used as solid state lasers [3]. The optical properties of YAP crystals doped with various impurities such as Ce, Mn, Ho, Tm, Er, Pr, Cu, Dy, Sm, Yb, Cr, Eu and Nd are extensively studied [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. These doped YAP crystals also have an excellent emission characteristics in UV/visible range when irradiated with ionizing radiation and hence, it is being used in radiation dose measurements as an active element (e.g.…”

Shape tailored green synthesis of CeO 2 :Ho 3+ nanopowders, its structural, photoluminescence and gamma radiation sensing properties

“…The frequency factor (s) [59,60] can be evaluated using the equation: Table.4. It is evident from the Table 4, the first glow peak at 118°C, the defect is mainly due to surface trap.…”

Solution Combustion Synthesis and Energy Transfer in LaMgAl11O19:Tb3+/Sm3+ Tunable Phosphor

“…Consequently, possible ET process among RE combinations in various materials have been reported earlier, especially Ce 3+ →Tb 3+ , Tb 3+ →Sm 3+ , Tb 3+ →Eu 3+ , Sm 3+ →Eu 3+ , Dy 3+ →Sm 3+ etc. [2][3][4][5][6][7][8][9][10][11]. ET mechanism in potassium-fluoro-phosphate glasses has been investigated for Tb 3+ -Sm 3+ pair [12].…”