The up-conversion luminescence of Yb3+-doped yttriurn lanthanum oxide transparent ceramic was investigated. It was ascribed to cooperative luminescence originated from the coupled states of the Yb3+ ion pairs. The proper doping of La2O3 can remove the cooperative luminescence of Yb3+ ion. But excessive La2O3 (at least 10 at.%) the cooperative up-conversion of Yb3+:Y2O3 is obtained again, and the intensity of up-conversion luminescence strengthens with the increase of La2O3 content. (c) 2007 Elsevier B.V. All rights reserved.
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机译：研究了掺Yb3 +的钇三氧化镧镧系透明陶瓷的上转换发光。这归因于源于Yb3 +离子对耦合态的协同发光。适当掺杂La2O3可以消除Yb3 +离子的协同发光。但是再次获得过量的La 2 O 3（至少10原子％）Yb 3+：Y 2 O 3的协同上转换，并且上转换发光的强度随着La 2 O 3含量的增加而增强。 （c）2007 Elsevier B.V.保留所有权利。
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