Pr3+ 1S0→Cr3+ energy transfer and ESR investigation in Pr3+ and Cr3+ activated SrAl12O19 quantum cutting phosphor

Abstract

With the help of the Dexter’s theory, the energy transfer mechanism from Pr 3+ 1 S0 to Cr 3+ is investigated theoretically in SrAl12O19:Pr 3+ ,C r 3+ quantum cutting phosphors. The electron spin resonance (ESR) spectra of Pr 3+ and Cr 3+ -doped SrAl12O19 with magnetoplumbite structure have been studied. The Cr 3+ ion is found to enter the Al4(4f) site, which is very close to the Sr(2d) site replaced by the Pr 3+ ions in the host. The theoretical results indicate that the efficient Pr 3+ 1 S0-Cr 3+ energy transfer can only take place in the intermediate mirror planes, in which for the nearest and next-nearest Pr 3+ –Cr 3+ pairs, both dipole–dipole and dipole–quadrupole interactions can play their parts in the transfer. Finally, an overview is given about the research on the energy transfer from Pr 3+ 1 S0 to codopants in their co-doped materials.