Higher excited state luminescence in Ti2+:MgCl2 Dynamics of radiative and nonradiative processes

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Abstract

Spectroscopic measurements on a single crystal of 1% Ti2+:MgCl2 show that luminescence occurs at low temperatures not only from the 1Eg(D3d) first excited state but also from the 3T1g(t2geg)(Oh) higher excited state, resulting in a broa broad emission band at 13 340 cm-1. An interesting situation arises when the crystal is excited through the 3T1g(t2g)23T1g(t2ge g)(Oh) absorption in the visible. It results in a competition between the two luminescence transitions, and by studying rise and decay times as well as intensity ratios as a function of temperature a detailed picture of the dynamics for the relevant radiative and nonradiative process can be obtained. Our main conclusion is that, above 40 K, an efficient nonradiative pathway exists from 3T1g(t2geg) directly to the ground state which bypasses the 1Eg emitting state. Using excited state excitation (ESE) spectroscopy we have been able to observe the 1Eg(t2g)2(D3d)→1A1g(t2g)2 and 1T2g(t2geg)(Oh) transitions for the first time.

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