Time-resolved photoluminescence spectroscopy of NbNb4+ and O- polarons in LiNbO3 single crystals

被引：12

作者：

Kaempfe, T. ^{[1
,2
]}

Haussmann, A. ^{[1
,2
]}

Eng, L. M. ^{[1
,2
]}

Reichenbach, P. ^{[1
]}

Thiessen, A. ^{[1
]}

Woike, T. ^{[3
]}

Steudtner, R. ^{[4
]}

机构：

[1] Tech Univ Dresden, Inst Angew Photophys, D-01069 Dresden, Germany

[2] Ctr Adv Elect Dresden Cfaed, D-01062 Dresden, Germany

[3] Tech Univ Dresden, Inst Strukturphys, D-01069 Dresden, Germany

[4] Helmholtz Zentrum Dresden Rossendorf, Inst Ressourcenokol, D-01328 Dresden, Germany

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 17期

关键词：

DOPED LITHIUM-NIOBATE; LUMINESCENCE; DEFECTS; PULSES; DECAY;

D O I：

10.1103/PhysRevB.93.174116

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We probe here the optical relaxation properties of Mg-doped wide-band-gap LiNbO3 single crystals with both a high spectral and temporal resolution at cryogenic temperatures. Surprisingly, we observe the photoluminescence to decay in a two-step process: a fast relaxation and a slower one centered around an energy E-max = 2.62 +/- 0.05 eV. Both decays fit well to the stretched-exponential behavior. Moreover, we are able to associate these energies to the recombination of light-induced Nb-Nb(4+) and O- small polarons. Also, we checked the stability of our findings by using LiNbO3 single crystals that show on-purpose modified radiative recombination processes, i.e., with a Mg doping both above and below the optical damage resistance threshold, as well as with different poling histories of inverted domains.

引用

页数：8

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