Three types of upconversion photoluminescent material were reported,which are sensitive to infrared radiation and can emit orange red light.The luminescence and absorption spectra,relative sensitivity and input output relationship were presented.
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Chen Shuchun Dai Fengmei. A KIND OF HIGH EFFICIENCY INFRARED UPCONVERSION LUMINESCENT MATERIAL[J]. Journal of Infrared and Millimeter Waves,1996,15(3):199~202