Investigation on the red shift of the charge transfer band in Eu3+ doped REMO3 (RE = Lu/Y/La; M = B/Al) phosphors

Abstract

A series of Eu3+-doped REMO3 (RE = Lu/Y/La; M = B/Al) phosphors have been synthesized via a high-temperature solid-state method. With the increase of the cation radius from Lu3+ ion to Y3+ ion to La3+ ion in Eu3+-doped REMO3 matrices, the Eu-O charge transfer (CT) energy decreases and the full width at half maximum (FWHM) increases. With the change of cation in the borate radical and aluminate radical from B3+ ion (0.27 Å) to Al3+ ion (0.535 Å), the red-shift of the Eu-O CT band occurs, and their FWHMs increase. Our work provides a reference for Eu3+-doped other complex oxides.