Funct. Mater. 2023; 30 (3): 325-331.
Effect of temperature on luminescence properties of Eu2+-doped calcium chloroborate
A.V.Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine, 86 Lustdorfskaya Doroga, 65080 Odessa, Ukraine
Calcium chloroborate Ca2BO3Cl doped with Eu2+ ions is known as the promising phosphor for white LEDs. Recently, this material has attracted additional attention due to its very long persistent luminescence. In the present work, the luminescence properties of Eu2+ ions in Ca2BO3Cl were studied for the first time at cryogenic temperatures. It is shown that with increasing temperature from 80 K (10 K) to 293 K, the maximum of the Eu2+ 4f65d→4f7 emission is shifted to shorter wavelengths from ~ 590 nm to 576 nm and the full width at half maximum of the emission band increases from 2185 to 2980 cm-1. The blue shift of the Eu2+ emission maximum is ascribed to temperature induced population of higher energy Eu2+ 4f65d states. At 80 K, the decay time of the Eu2+ emission in Ca2BO3Cl was found to be somewhat smaller than that recorded at 293 K (1.05 μs vs. 1.14 μs). Possible explanations for this unusual observation are also discussed.
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