Luminescence decay and schematic IVCT process (IMAGE)
Caption
a, Cryogenic (80 K) luminescence decay curves of LaMgGa₁₁O₁₉:0.05Cr³⁺ sample monitoring at 720, 780, 890, and 1200 nm. The luminescence decay lifetime monitoring at 1200 nm is 2.3 ms, validating the anomalous is not related to Cr⁴⁺ impurity and magnetic interaction of Cr³⁺-Cr³⁺ pairs. b Magnified cryogenic PL and PLE spectra of LaMgGa₁₁O₁₉:0.05Cr³⁺ sample to estimate the ZPL energies; c Schematic luminescence mechanism based on IVCT. The IVCT between Cr³⁺ centers can be broken down into two separate single-center processes: the oxidation of a Cr³⁺ ion (i.e. Cr³⁺ e(VB) + Cr⁴⁺) and the reduction of another Cr³⁺ ion (i.e. Cr³⁺ + e(VB) Cr²⁺). The radiative luminescence occurs from the ⁵E ground state of Cr²⁺ ions back to the ⁴A₂ ground state of Cr³⁺.
Credit
by Shengqiang Liu, Jingxuan Du, Zhen Song, Chonggeng Ma, Quanlin Liu
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License
CC BY