Add time:09/30/2019         Source:infona.pl

Time-resolved luminescence spectra have been measured in NaGdF 4 :Eu 3 + in order to investigate quantum cutting in which two visible photons are emitted for one-photon absorption. In a Gd 3 + -Eu 3 + system, two processes of energy transfer from Gd 3 + to Eu 3 + are dominant in the quantum cutting: a cross-relaxation (CR) process and a direct-transfer (DT) process. In temporal profiles of the luminescence spectra, it was found that one visible emission undergoing the CR process indicates a fast decay, and the other undergoing the DT process indicates a rising form. These results are explained by two energy-transfer processes contributing to the quantum cutting process.

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