Research of the thermal shift parameters for the spectral line 5D0→7F1 in Eu3+-doped Y3Al5O12 crystal

Abstract

The thermal blue shift of spectral line E(5D0→7F1) in Eu3+-doped Y3Al5O12 (YAG) crystal is analyzed by means of a full expression containing both the static effect (characterized by static parameter A) owing to lattice thermal expansion and the dynamic effect (characterized by electron-phonon coupling parameter α’) due to electron-phonon interaction. The static effect is estimated from the pressure dependence of the spectral line position. The thermal shift parameters A and α’ are evaluated in terms of an approximate processing in spite of the lack of the thermal shift curve from low temperature (T < 30 K) to room and higher temperatures. The positive sign of parameter A and the negative sign of parameter α’ suggest that the static and dynamic effects result in the thermal blue shift and red shift, respectively, and the observed thermal blue shift in YAG: Eu3+ is owing to the static effect in magnitude being greater than the dynamic one. The outcomes are discussed.