In this paper,we developed low dose X-ray induced long afterglow phosphor Ca_(2)P_(2)O_(7):Pr^(3+),which shows excellent afterglow luminescence from ultraviolet C(UVC)to red region.The photoluminescent results show th...In this paper,we developed low dose X-ray induced long afterglow phosphor Ca_(2)P_(2)O_(7):Pr^(3+),which shows excellent afterglow luminescence from ultraviolet C(UVC)to red region.The photoluminescent results show that under 445.7 nm excitation,Ca_(1.995)P_(2)O_(7):0.5%Pr3+displays red emissions peaked at 598.3 and651.9 nm,corresponding to1D2-3H4and3P0-3F2transitions of Pr^(3+),respectively.Due to its pure red emission(CIE coordinates(0.59101,0.39926)),Ca_(1.995)P_(2)O_(7):0.5%Pr^(3+)can be regarded as a potential LED red phosphor.More importantly,Ca_(2)P_(2)O_(7):Pr^(3+)shows long afterglow luminescence from UVC to red region,which consists of four co ntinuous emissions with similar intensity including 260,359,466 and 598.3 nm.Since these afterglow continuous emissions are fitted to the absorption of most photodynamic therapy(PDT)agents,Ca_(2)P_(2)O_(7):Pr^(3+)can be regarded as excellent PDT agents.Furthermo re,30 s X-ray irradiation can induce 5400 s decay of Ca_(1.997)P_(2)O_(7):0.3%Pr^(3+),and its afterglow emission intensity still reaches 5×10^(4)cps after 5400 s decay.Even only 5 s X-ray irradiation also can produce 4.75×10^(4)cps afterglow emis sion after10 s decay.In addition,the repeat 980 nm laser irradiations can induce co ntinuous strong photo-stimulated(PSL)luminescent peaks,which can be utilized to conduct high efficiency PDT without another X-ray irradiation.The thermoluminesce nce results reveal that the existence of shallow(0.89 eV)and deep traps are responsible for the excellent X-ray induced long afterglow and PSL luminescence.All these results suggest that Ca_(2)P2O7:Pr^(3+)possesses great potential to be regarded as high efficiency PDT agents.展开更多
A novel green long afterglow material CaGeO_(3):Tb^(3+)was synthesized by high temperature solid phase method.According to the experimental results,CaGeO_(3):Tb^(3+)is a green long persistent luminescent(LPL)material ...A novel green long afterglow material CaGeO_(3):Tb^(3+)was synthesized by high temperature solid phase method.According to the experimental results,CaGeO_(3):Tb^(3+)is a green long persistent luminescent(LPL)material with excellent performance.CaGeO_(3):Tb^(3+)shows LPL emission peak at 442,490.9,548.7,588.5 and 623.8 nm,corresponding to ^(5)D_(3) to^(7)F_(4)and^(5)D_(4)to^(7)F_(J)(J=6,5,4,3)transitions of Tb^(3+).Its CIE coordinates are(0.27,0.50),indicating that the afterglow emission is close to the light of green region.In addition,after the excitation source is turned off,the afterglow time is longer than 90 min.After an interval of 7 h,the photo-stimulation luminescence(PSL)can be observed by using 980 nm laser cyclic excitation.The thermoluminescence(ThL)results show that there are three types of traps in the material and their depths are 0.666,0.774 and 0.892 eV respectively,which are caused by the doping of Tb^(3+).All the results show that CaGeO_(3):Tb^(3+)is an excellent long afterglow luminescent material.展开更多
基金Project supported by the fund of"Two-Hundred Talent"plan of Yantai Citythe National Natural Science Foundation of China(11974013)+1 种基金Natural Science Foundation of Fujian Province(2022J011270)the State Key Research Project of Shandong Natural Science Foundation(ZR2020KB019)。
文摘In this paper,we developed low dose X-ray induced long afterglow phosphor Ca_(2)P_(2)O_(7):Pr^(3+),which shows excellent afterglow luminescence from ultraviolet C(UVC)to red region.The photoluminescent results show that under 445.7 nm excitation,Ca_(1.995)P_(2)O_(7):0.5%Pr3+displays red emissions peaked at 598.3 and651.9 nm,corresponding to1D2-3H4and3P0-3F2transitions of Pr^(3+),respectively.Due to its pure red emission(CIE coordinates(0.59101,0.39926)),Ca_(1.995)P_(2)O_(7):0.5%Pr^(3+)can be regarded as a potential LED red phosphor.More importantly,Ca_(2)P_(2)O_(7):Pr^(3+)shows long afterglow luminescence from UVC to red region,which consists of four co ntinuous emissions with similar intensity including 260,359,466 and 598.3 nm.Since these afterglow continuous emissions are fitted to the absorption of most photodynamic therapy(PDT)agents,Ca_(2)P_(2)O_(7):Pr^(3+)can be regarded as excellent PDT agents.Furthermo re,30 s X-ray irradiation can induce 5400 s decay of Ca_(1.997)P_(2)O_(7):0.3%Pr^(3+),and its afterglow emission intensity still reaches 5×10^(4)cps after 5400 s decay.Even only 5 s X-ray irradiation also can produce 4.75×10^(4)cps afterglow emis sion after10 s decay.In addition,the repeat 980 nm laser irradiations can induce co ntinuous strong photo-stimulated(PSL)luminescent peaks,which can be utilized to conduct high efficiency PDT without another X-ray irradiation.The thermoluminesce nce results reveal that the existence of shallow(0.89 eV)and deep traps are responsible for the excellent X-ray induced long afterglow and PSL luminescence.All these results suggest that Ca_(2)P2O7:Pr^(3+)possesses great potential to be regarded as high efficiency PDT agents.
基金Project supported by the State Key Research Projects of Shandong Natural Science Foundation(ZR2020KB019)the fund of"Two-Hundred Talent"Plan of Yantai City+1 种基金the National Natural Science Foundation of China(11974013)the Natural Science Foundation of Fujian Province(2022J011270)。
文摘A novel green long afterglow material CaGeO_(3):Tb^(3+)was synthesized by high temperature solid phase method.According to the experimental results,CaGeO_(3):Tb^(3+)is a green long persistent luminescent(LPL)material with excellent performance.CaGeO_(3):Tb^(3+)shows LPL emission peak at 442,490.9,548.7,588.5 and 623.8 nm,corresponding to ^(5)D_(3) to^(7)F_(4)and^(5)D_(4)to^(7)F_(J)(J=6,5,4,3)transitions of Tb^(3+).Its CIE coordinates are(0.27,0.50),indicating that the afterglow emission is close to the light of green region.In addition,after the excitation source is turned off,the afterglow time is longer than 90 min.After an interval of 7 h,the photo-stimulation luminescence(PSL)can be observed by using 980 nm laser cyclic excitation.The thermoluminescence(ThL)results show that there are three types of traps in the material and their depths are 0.666,0.774 and 0.892 eV respectively,which are caused by the doping of Tb^(3+).All the results show that CaGeO_(3):Tb^(3+)is an excellent long afterglow luminescent material.
