The 1.55μm laser technology is widely applied in military,information communication,biomedicine and other fields.With the deepening development of these application areas,the demand for novel 1.55μm laser gain media...The 1.55μm laser technology is widely applied in military,information communication,biomedicine and other fields.With the deepening development of these application areas,the demand for novel 1.55μm laser gain media is becoming increasingly urgent.This study reports a novel Yb^(3+),Er^(3+)co-doped KBa_(0.94)Ca_(0.06)Y(MoO_(4))_(3) (KBCYM)crystal.In this crystal,Yb^(3+)serves as a sensitizer,significantly enhancing the emission intensity of Er^(3+)in both visible and near-infrared bands.Notably,when the concentration of Yb^(3+)reaches 6 mol%,the emission intensity peaks at 1.55μm.Optical cross-section calculations reveal that the crystal exhibits a low laser pumping threshold at this concentration,demonstrating its potential as a laser gain medium.However,the crystal inevitably generates thermal effects during operation,which may adversely affect its performance.Therefore,real-time monitoring of the operating temperature is crucial.The thermal stability of the crystal was evaluated by measuring the temperature dependence of its luminescence intensity in the near-infrared band.Remarkably,even when the temperature rises to 553 K,the emission intensity at 1.55μm only decreases by 10.9%.Additionally,the temperature sensing performance was evaluated using fluorescence intensity ratio techniques,yielding absolute and relative sensitivities of 0.00981 K^(-1)at 453 K and 1.32%/K at 303 K,respectively,highlighting its potential for optical temperature sensing.Finally,through leveraging the unique properties of Yb^(3+),Er^(3+):KBCYM crystals,we successfully developed 1.55μm luminescent optical devices with practical applications.These devices not only exhibit efficient luminescent performance,but also possess a self-temperature measu rement functio n,opening up new avenues for the further development of laser technology.展开更多
In modern forensic science,fingerprints are critical evidence due to their uniqueness and difficulty to replicate.However,it is challenging to observe and identify some latent fingerprints(LFP),because alternative pro...In modern forensic science,fingerprints are critical evidence due to their uniqueness and difficulty to replicate.However,it is challenging to observe and identify some latent fingerprints(LFP),because alternative processing methods for recognition are often required.The use of Eu^(3+)-doped phosphors,which emit red-orange light,presents an effective approach for enhancing the visibility of LFP.Eu^(3+)-doped Ba_(2)LuSbO_(6)(BLSO)phosphors were synthesized using a high-temperature solid-state method,aiming to improve the recognition of LFP for enhanced fingerprint identification.The phase structure of the fluorescent powder samples was analyzed through X-ray diffraction(XRD)combined with Rietveld refinement,as well as scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).Photoluminescence spectra of Ba_(2)LuSbO_(6):xEu^(3+)phosphor samples exhibit orange-red emission peaks at595 and 618 nm when excited by 250 nm deep ultraviolet light.Concentration quenching is observed at a doping concentration of 20 mol%.The Ba_(2)LuSbO_(6):0.2Eu^(3+)phosphor sample demonstrates exceptional thermal stability,with value of 92.50% at 423 K.The quantum efficiency of the Ba_(2)LuSbO_(6):0.2Eu^(3+)phosphor sample was evaluated using an integrating sphere,yielding an IQE of 79.34%.In order to visualize latent fingerprints(LFPs),hydrophilic BLSO:0.2Eu^(3+)phosphors were transformed into hydrophobic BLSO:0.2Eu^(3+)@OA phosphors through a coating of oleic acid(OA).The BLSO:0.2Eu^(3+)@OA phosphor proves capable of generating dependable LFP fluorescence images with superior contrast and resolution.These findings underscore the significant potential for application of BLSO:0.2Eu^(3+)products LFP visualization.展开更多
In the process of developing high-performance LCDs,narrow-band emitting phosphors with excellent performance are indispensable.In this study,a narrow-band blue phosphor BaZnAl_(10)O_(17):Eu^(2+)with an emission peak a...In the process of developing high-performance LCDs,narrow-band emitting phosphors with excellent performance are indispensable.In this study,a narrow-band blue phosphor BaZnAl_(10)O_(17):Eu^(2+)with an emission peak at 433 nm(which can be excited by near-ultraviolet light)and a full width at half maximum of 46 nm was found.The synthesized BaZnAl_(10)O_(17):Eu^(2+)phosphor exhibits low thermal quenching behavior.There is only 16.4%loss in emission intensity at 423 K compared to the initial intensity at room temperature.Using the narrow-band emission phosphor BaZnAl_(10)O_(17):Eu^(2+)as the blue light source,the prepared white LED device excited using a near-ultraviolet chip emits high-brightness white light(CCT=4436 K,R_(a)=93.96),whose CIE coordinates are(0.3387,0.3785)and CG can reach 99%of the NTSC standard.The narrow-band blue-emitting BaZnAl_(10)O_(17):Eu^(2+)phosphor has potential application value in white light-emitting diodes.展开更多
基金Project supported by Jilin Provincial Department of Education(JJKH20230821KJ,JJKH20230822KJ,JJKH20230823KJ,JJKH20240930KJ,20240101107JC)。
文摘The 1.55μm laser technology is widely applied in military,information communication,biomedicine and other fields.With the deepening development of these application areas,the demand for novel 1.55μm laser gain media is becoming increasingly urgent.This study reports a novel Yb^(3+),Er^(3+)co-doped KBa_(0.94)Ca_(0.06)Y(MoO_(4))_(3) (KBCYM)crystal.In this crystal,Yb^(3+)serves as a sensitizer,significantly enhancing the emission intensity of Er^(3+)in both visible and near-infrared bands.Notably,when the concentration of Yb^(3+)reaches 6 mol%,the emission intensity peaks at 1.55μm.Optical cross-section calculations reveal that the crystal exhibits a low laser pumping threshold at this concentration,demonstrating its potential as a laser gain medium.However,the crystal inevitably generates thermal effects during operation,which may adversely affect its performance.Therefore,real-time monitoring of the operating temperature is crucial.The thermal stability of the crystal was evaluated by measuring the temperature dependence of its luminescence intensity in the near-infrared band.Remarkably,even when the temperature rises to 553 K,the emission intensity at 1.55μm only decreases by 10.9%.Additionally,the temperature sensing performance was evaluated using fluorescence intensity ratio techniques,yielding absolute and relative sensitivities of 0.00981 K^(-1)at 453 K and 1.32%/K at 303 K,respectively,highlighting its potential for optical temperature sensing.Finally,through leveraging the unique properties of Yb^(3+),Er^(3+):KBCYM crystals,we successfully developed 1.55μm luminescent optical devices with practical applications.These devices not only exhibit efficient luminescent performance,but also possess a self-temperature measu rement functio n,opening up new avenues for the further development of laser technology.
基金Project supported by the Scientific Research Project of Jilin Provincial Department of Education(JJKH20230821KJ,JJKH20230823KJ,JJKH20230822KJ)。
文摘In modern forensic science,fingerprints are critical evidence due to their uniqueness and difficulty to replicate.However,it is challenging to observe and identify some latent fingerprints(LFP),because alternative processing methods for recognition are often required.The use of Eu^(3+)-doped phosphors,which emit red-orange light,presents an effective approach for enhancing the visibility of LFP.Eu^(3+)-doped Ba_(2)LuSbO_(6)(BLSO)phosphors were synthesized using a high-temperature solid-state method,aiming to improve the recognition of LFP for enhanced fingerprint identification.The phase structure of the fluorescent powder samples was analyzed through X-ray diffraction(XRD)combined with Rietveld refinement,as well as scanning electron microscopy(SEM)and X-ray photoelectron spectroscopy(XPS).Photoluminescence spectra of Ba_(2)LuSbO_(6):xEu^(3+)phosphor samples exhibit orange-red emission peaks at595 and 618 nm when excited by 250 nm deep ultraviolet light.Concentration quenching is observed at a doping concentration of 20 mol%.The Ba_(2)LuSbO_(6):0.2Eu^(3+)phosphor sample demonstrates exceptional thermal stability,with value of 92.50% at 423 K.The quantum efficiency of the Ba_(2)LuSbO_(6):0.2Eu^(3+)phosphor sample was evaluated using an integrating sphere,yielding an IQE of 79.34%.In order to visualize latent fingerprints(LFPs),hydrophilic BLSO:0.2Eu^(3+)phosphors were transformed into hydrophobic BLSO:0.2Eu^(3+)@OA phosphors through a coating of oleic acid(OA).The BLSO:0.2Eu^(3+)@OA phosphor proves capable of generating dependable LFP fluorescence images with superior contrast and resolution.These findings underscore the significant potential for application of BLSO:0.2Eu^(3+)products LFP visualization.
基金supported by the Government Funded Projects(627010104)the International Science Technology Cooperation Project of Jilin Province Science,the Technology Department(20200801038GH)the Key Laboratory for Comprehensive Energy Saving of Cold Regions Architecture of Ministry of Education,Jilin Jianzhu University(JLZHKF022021001).
文摘In the process of developing high-performance LCDs,narrow-band emitting phosphors with excellent performance are indispensable.In this study,a narrow-band blue phosphor BaZnAl_(10)O_(17):Eu^(2+)with an emission peak at 433 nm(which can be excited by near-ultraviolet light)and a full width at half maximum of 46 nm was found.The synthesized BaZnAl_(10)O_(17):Eu^(2+)phosphor exhibits low thermal quenching behavior.There is only 16.4%loss in emission intensity at 423 K compared to the initial intensity at room temperature.Using the narrow-band emission phosphor BaZnAl_(10)O_(17):Eu^(2+)as the blue light source,the prepared white LED device excited using a near-ultraviolet chip emits high-brightness white light(CCT=4436 K,R_(a)=93.96),whose CIE coordinates are(0.3387,0.3785)and CG can reach 99%of the NTSC standard.The narrow-band blue-emitting BaZnAl_(10)O_(17):Eu^(2+)phosphor has potential application value in white light-emitting diodes.
