Cooperative radiative and nonradiative effects in K2NaScF6 codoped with V3+ and Er3+

被引：11

作者：

Reinhard, C ^{[1
]}

Krämer, K ^{[1
]}

Biner, DA ^{[1
]}

Güdel, HU ^{[1
]}

机构：

[1] Univ Bern, Dept Chem & Biochem, CH-3000 Bern 9, Switzerland

来源：

JOURNAL OF CHEMICAL PHYSICS | 2004年 / 120卷 / 07期

关键词：

D O I：

10.1063/1.1640335

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

K2NaScF6 crystals codoped with V3+ and Er3+ exhibit some novel cooperative near-IR to visible upconversion processes at cryogenic temperatures. V3+ mainly acts as a broadband sensitizer. The V3+ T-3(1g)-->T-3(2g) excitation between 13 500 and 15 500 cm(-1), after fast relaxation to V3+ T-1(2g), can be transferred to Er3+ I-4(11/2), and then upconversion takes place. Four upconversion mechanisms are identified and characterized. For narrow-band laser excitation the overall efficiency of the upconversion processes is low. However, at 12 K for broadband excitation, such as in a lamp, between 12 000 and 14 500 cm(-1) the number of emitted visible photons is roughly doubled by codoping V3+ in addition to Er3+. (C) 2004 American Institute of Physics.

引用

页码：3374 / 3380

页数：7

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