PHOTOPYROELECTRIC-QUANTUM-YIELD SPECTROSCOPY AND QUANTUM-MECHANICAL PHOTOEXCITATION-DECAY KINETICS OF THE TI3+ ION IN AL2O3

被引:38
作者
GRINBERG, M [1 ]
MANDELIS, A [1 ]
机构
[1] UNIV TORONTO,DEPT MECH ENGN,PHOTOTHERMAL & OPTOELECTR DIAGNOST LAB,TORONTO M5S 1A4,ONTARIO,CANADA
来源
PHYSICAL REVIEW B | 1994年 / 49卷 / 18期
关键词
D O I
10.1103/PhysRevB.49.12496
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Quadrature photopyroelectric spectra of the optical-to-thermal (nonradiative) energy conversion efficiency of Ti3+:Al2O3 crystals were found to yield good agreement between the experimental quantum-yield spectrum of this optical material and detailed quantum-mechanical calculations of the nonradiative and radiative deexcitation kinetics of the Ti3+ ion in the Al2O3 host matrix. Both inter- and intraconfigurational decay mechanisms of the excited-state manifold were considered including fast nonradiative relaxations. The experimental quantum-yield spectra were found to be dominated by intraconfigurational nonradiative relaxation below the excited- and ground-electronic-state manifold crossover energy, E(nr); and by internal conversion processes in the highly vibronically excited Ti3+ ion above E(nr). A one-parameter fit of the quantum-yield model to the data gave the intraconfigurational relaxation time constant tau(intra) for the Ti3+.Al2O3 System. The present combined experimental and theoretical approach can be more generally applicable to other optoelectronic systems exhibiting strong electron-lattice coupling.
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页码:12496 / 12506
页数:11
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