Photoluminescence properties and energy transfer of Eu2+/Pr3+ codoped GeS2–Ga2S3–CsCl chalcohalide glasses

Photoluminescent properties of Eu2+/Pr3+ codoped GeS2–Ga2S3–CsCl chalcohalide glasses are investigated. The Pr3+ visible emissions are significantly enhanced with the codoping of Eu2+ under the near ultraviolet (NUV) excitation. The excitation cross-section of the Eu2+/Pr3+ codoped glass is almost three times as great as that of the Pr3+ singly doped glass. High energy transfer (ET) efficiency up to 80% from Eu2+ to Pr3+ is obtained in the codoped glasses. The dependences of emission spectra and decay curves on the concentrations of Eu2+ and Pr3+ are presented and the relevant ET mechanism is discussed.