title: Co-transition absorption property of K2ZnCl4:Co2+ crystal.
abstract: Single-crystal K(2)ZnCl(4) 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 650 nm, was associated with the transition (4)A(2)-->(4)T(1P), and a novel and important result that corporate transition (co-transition) between (4)A(2)-->(4)T(1F) and (4)A(2)-->(4)T(2) of Co2+ in the region of 1300-2400 nm 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 4.82 eV, was lower than that of pure K2ZnCl4.
authors.affiliation: Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002 Fujian, China.
authors.forename: Chaoyang
authors.initials: C
authors.lastname: Tu
authors.forename: Fugui
authors.initials: F
authors.lastname: Yang
authors.forename: Jianfu
authors.initials: J
authors.lastname: Li
authors.forename: Guohua
authors.initials: G
authors.lastname: Jia
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: You
authors.forename: Hongyan
authors.initials: H
authors.lastname: Wang
authors.forename: Yanping
authors.initials: Y
authors.lastname: Wei
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhaojie
authors.initials: Z
authors.lastname: Zhu