Journal
JOURNAL OF LUMINESCENCE
Volume 235, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2021.118065
Keywords
Photoluminescence; Time-resolved spectroscopy; et No3ions
Categories
Funding
- Estonian Research Council [PUT PRG619]
- Polish National Science Centre [2018/31/B/ST8/00774, 2019/33/B/ST8/02142]
- National Research Foundation of Ukraine [0120U105299]
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The photoluminescence characteristics of undoped and Bi3+ - doped Ca3Ga2Ge3O12 garnets were investigated in the 4.2-500 K temperature range. Under excitation in the Bi3+ - related absorption band, ultraviolet and visible emissions were observed, with the ultraviolet emission bands attributed to the radiative decay of the triplet relaxed excited state of Bi3+ ions.
Photoluminescence characteristics of the undoped and Bi3+ - doped Ca3Ga2Ge3O12 garnets are investigated in the 4.2?500 K temperature range by the methods of steady-state and time-resolved spectroscopy. The Bi3+ ions substituting for Ca2+ ions in the garnet Ca3Ga2Ge3O12 and parasitic Ca5Ge3O11 phases are revealed by the X-ray diffraction method. Under excitation in the Bi3+ - related absorption band, the ultraviolet and visible emissions are observed in Ca3Ga2Ge3O12:Bi. The ultraviolet emission bands are ascribed to the radiative decay of the triplet relaxed excited state of Bi3+ ions having different nearest surroundings. A visible emission is found to arise from an exciton localized around a Bi3+ ion. The suggestion is made that the lowest-energy excited level of Bi3+ is located close to the bottom of the conduction band of Ca3Ga2Ge3O12. The mechanisms of the processes, resulting in the appearance of luminescence of the undoped and Bi3+ - doped Ca3Ga2Ge3O12 garnets, are discussed.
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