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dc.contributor.authorLi, A. H.zh_CN
dc.contributor.authorSun, Z. J.zh_CN
dc.contributor.authorLu, Q.zh_CN
dc.contributor.author李艾华zh_CN
dc.contributor.author孙志军zh_CN
dc.date.accessioned2015-07-22T07:23:36Z
dc.date.available2015-07-22T07:23:36Z
dc.date.issued2013zh_CN
dc.identifier.citationJOURNAL OF NANOPARTICLE RESEARCH, 2013,15(1)zh_CN
dc.identifier.otherWOS:000318550000062zh_CN
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/91792
dc.descriptionNational Key Scientific Program [2012 CB933503]; Natural Science Foundation of Fujian Province of China [2011J06002]; Fundamental Research Funds for the Central Universities [2012121009]zh_CN
dc.description.abstractUnder 980-nm laser diode excitation, a phenomenon on an over-2-slope in log(I)-versus-log( P) plot for red upconversion (UC) luminescence in Er3+-doped nanopowders is usually observed. Due to the existence of many energy-trapping centers on their surfaces, the laser heating effect is shown very prominently in these nanopowders. In this submission, the influence of laser heating on the power dependence of UC luminescence in NaGdF4:Er3+/Yb3+@ Citrate nanopowders is investigated. In the experimental works, sub-20-nm beta-NaGdF4:Er3+/Yb3+@Citrate nanoparticles were synthesized at 185 degrees C through a solvothermal route. Then we found that UC luminescence at 524 and 657 nm displayed an over-2-slope in log(I)-versus-log( P) plot. The over-2-slope for 524-nm UC luminescence can be well explained from the greater proportion of population at the H-2(11/2) level, which is thermally populated from the S-4(3/2) level, with increase of the excitation power. Cross relaxation of H-2(11/2) + I-4(13/2) -> F-4(9/2) + I-4(11/2) is proposed to feed F-4(9/2) from H-2(11/2) levels, which explains the over-2-slope in log(I)-versus-log( P) plot for red two-photon UC luminescence.zh_CN
dc.language.isoen_USzh_CN
dc.publisherSPRINGERzh_CN
dc.source.urihttp://dx.doi.org/10.1007/s11051-012-1377-4zh_CN
dc.subjectLANTHANIDE-DOPED NANOCRYSTALSzh_CN
dc.subjectSHAPE-CONTROLLABLE SYNTHESISzh_CN
dc.subjectUPCONVERTING NANOPARTICLESzh_CN
dc.subjectIN-VIVOzh_CN
dc.subjectFLUORESCENCEzh_CN
dc.subjectEMISSIONzh_CN
dc.subjectCELLSzh_CN
dc.subjectCOREzh_CN
dc.subjectAGENTzh_CN
dc.subjectPHASEzh_CN
dc.titleLaser heating effect on the power dependence of upconversion luminescence in Er3+-doped nanopowderszh_CN
dc.typeArticlezh_CN


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