Infrared-excited bright green and red luminescence in La3Ga5.5Ta0.5O14 doped with erbium and ytterbium

Judd–Ofelt analysis of ceramic La3Ga5.5Ta0.5O14 doped with Er3+

“…The quantum efficiency shares this weak dependence. The values of the quantum efficiency of ( 2 H 11/2 , 4 S 3/2 ) obtained in this paper using our JO parameters are inferior to the values obtained previously (0.58 [11]; this value was obtained using the radiative lifetimes given in Ref. [8]).…”

“…The measured lifetime of 4 F 9/2 level is τ( 4 F 9/2 ) ¼11 ms [11]. The resulting quantum efficiency is 0.025 (samples with 0.68 mm and 0.24 mm thickness) or 0.026 (0.38 mm thickness).…”

“…In order to calculate the quantum efficiency of the thermalized levels ( 2 H 11/2 , 4 S 3/2 ), a radiative lifetime of this pair should be estimated; their common radiative lifetime can be calculated with [21] Approximating the bandgap between them to ΔEE800 cm À 1 [8], the values obtained for τ rad ( 2 H 11/2 , 4 S 3/2 ) are 470.81 ms for the 0.68 mm sample, 457.47 ms for the 0.38 mm sample and 450.66 ms for the 0.24 mm sample. The quantum efficiency defined as the ratio between the experimental lifetime (160 ms [11]) and the radiative lifetime is 0.34 for d ¼0.68 mm, 0.35 for d¼ 0.38 mm, and 0.36 for the thinnest sample. According to Eq.…”

“…Details concerning the synthesis can be found elsewhere [11]. Three LGT ceramic pellets with 3 at% Er 3 þ and 12 mm diameter and various thickness (0.68 mm, 0.38 mm and 0.24 mm) were cut from the same sample.…”

Luminescence in lanthanum-gallium tantalate

“…Luminescence has now been obtained in rare-earth element doped langatate crystals e.g. Ho, Eu, Sm, Er, Yb [13][14][15][16][17][18][19][20][21]. However, the luminescent properties of the undoped LGT crystal matrix and the effect of crystal synthesis conditions on these properties have yet been studied insufficiently.…”