Broadband downconversion based infrared quantum cutting by cooperative energy transfer from Eu~(2+) to Yb~(3+) in glasses

摘要

Near-infrared quantum cutting involving the emission of near-infrared photons by downconversion cooperative energy transfer from Eu~(2+) to Yb~(3+) in borate glasses was reported. Electron spin resonance spectra and absorption spectra were measured to prove the existence of Eu~(2+) in borate glasses. Excitation, emission, and fluorescence decay measurements were performed to examine the occurrence of cooperative energy transfer from Eu~(2+) to Yb~(3+) ions. Yb~(3+) concentration dependent quantum efficiency was calculated and the maximum efficiency approaches 164.19%.