Wydział Chemii

Mirosław Karbowiak

Norman M. Edelstein

Janusz Drożdżyński

2003

Journal of Luminescence

104

197-205

10.1016/S0022-2313(03)00016-4

Naukowa

Angielski

Artykuł

Single crystals of Nd³⁺:RbY₂Cl₇ were grown by the Bridgman–Stockbarger method. The host crystal contains two slightly inequivalent Y³⁺ ions, each with an approximate C_2v site symmetry. Anti-Stokes emission from the ⁴G_7/2 and ⁴D_3/2 levels was observed after laser excitation of the ⁴F_3/2 and ⁴F_9/2 multiplets. Laser excitation at 413 cm⁻¹ or 453 cm⁻¹ above the ⁴F_3/2 multiplet resulted in emission from the ²P_1/2 level. Laser site-selective upconverted emission spectra have been measured, as well as their emission transients and power dependence. Possible excited state absorption and energy-transfer upconversion (ETU) mechanisms are proposed and discussed. Due to the smaller crystal field and a somewhat different energy level structure for the Nd³⁺ ions in RbY₂Cl₇ as compared with those observed for Nd³⁺ in fluoride or oxide hosts, the ⁴G_7/2 and ⁴D_3/2 multiplets are populated under ⁴F_3/2 excitation in a three and four step ETU process, respectively, instead of in a two and three step process as observed for the lighter hosts.

RbY2Cl7:Nd3+, Upconversion, Laser selective excitation and emission, Excited state absorption, Energy transfer

https://doi.org/10.1016/S0022-2313(03)00016-4

http://www.elsevier.com