Luminescence from Self-Trapped Holes in Manganese-Doped Calcium Fluoride Single Crystals

摘要

Thermally stimulated luminescence (TSL) and electron spin resonance (ESR) measurements on x-irradiated CaF sub 2 :Mn (0.1 wt %) single crystals have been conducted in the interval 70 to 300 K. Prominent TSL peaks occur near 150 K (345- and 495-nm emission) and 200 K (predominantly 495-nm emission) with thermal decay of ESR centers at these same temperatures. Taken collectively the data suggest that 150 K TSL emission is due to mobile holes from V/sub K/ centers recombining with both trapped electrons and Mn sup + ions, i.e., V/sub K/ + e sup - -> 345-nm emission, and V/sub K/ + Mn sup + -> (Mn sup 2+ )* + hv (495-nm emission). Additionally, H centers are formed by transformation of V/sub K/ centers. At 200 K, holes from H centers recombine with Mn sup + to produce excited-state (Mn sup 2+ )* which decays by emitting 495-nm radiation. (ERA citation 12:043628)