Upconversion luminescence of transparent Er3+-doped chalcohalide glass–ceramics

Abstract Upconversion luminescence of Er 3+ ions in chalcohalide glass and in transparent glass–ceramic samples under continuous wave and pulsed laser excitation in the 4 I 9/2 level has been studied. Green and red emissions corresponding to ( 2 H 11/2 , 4 S 3/2 ) →  4 I 15/2 and 4 F 9/2  →  4 I 15/2 transitions, respectively, have been observed and attributed to a two photon upconversion process. A significant increase of upconversion luminescence has been observed in the transparent glass–ceramics if compared with the one from the base glass. Moreover, the red emission corresponding to the 4 F 9/2  →  4 I 15/2 transition is enhanced in the glass–ceramics as compared to the green luminescence from ( 2 H 11/2 , 4 S 3/2 ) levels probably due to an increase of the energy transfer processes populating the 4 F 9/2 level. The possible excitation mechanisms responsible for this upconversion luminescence are discussed.

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