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Undoped host cannot give out light under the 254nm excitation. Its photoluminescence was not investigated because it has not luminescent center. The excitation spectrun was not measuremented directly. So,we believe the additional measurement (undoped matrix) is not necessary. The reference can help to localized the host lattice absorption band. It is obvious that the chromaticity coordinates were slighly different under different excitation wavenlengths. This slighly difference may relate to the apparatus response and/or the radiative/noradiative transition probability among the energy levels in the energy transfer process. 对以上英语句子的语法结构进行修正 符合语法和地道的英语 |
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qishimei1234
木虫 (小有名气)
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