Abstract

Single-crystal K2ZnCl4 doped with Co2+ has been grown successfully by use of the Czochralski technique. The absorption spectrum of the crystal was measured. The most intense line, centered at 650nm, was associated with the transition A24T1P4, and a novel and important result that corporate transition (co-transition) between A24T1F4 and A24T24 of Co2+ in the region of 13002400nm was found and discussed. The mechanism that caused the phenomenon was explained by energy-level splitting theory. In the tetrahedral approximation, using the quantum and Tanaba–Sugano theories, Racah parameter B and crystal field parameter 10Dq were calculated. The optical energy gap, deduced to be 4.82eV, was lower than that of pure K2ZnCl4.

© 2006 Optical Society of America

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