Phosphor-in-glass(PiG)has been prepared into various types of phosphor films owing to its simplicity process,exceptional color purity,and convenient color adjustability.Nevertheless,existing reflective PiGs films have...Phosphor-in-glass(PiG)has been prepared into various types of phosphor films owing to its simplicity process,exceptional color purity,and convenient color adjustability.Nevertheless,existing reflective PiGs films have encountered limitations in terms of stability and feasibility as reliable color converters,mainly attributed to issues related to thermal deposition and insufficient optical efficiency.Herein,we propose to use AlN substrate with superior thermal conductivity to coat the TiO_(2) layer to obtain TiO_(2)-AlN(TA),which enhances the reflectivity of blue light to facilitate the light conversion process.By incorporating highly thermally stable LuAG:Ce-PiGs on a TA substrate,the LuAG:Ce-PiTA converter exhibits a luminous flux of 1102 lm@6.4 W,and maintains a relative intensity of 94.6%at 473 K benefiting from the high thermal conductivity of 34.1 W/(m·K).The addition of CASN_(3):Eu to the color converter 50 L&10C-PiTA enables an impressive CRI of 90.7.Relative lumine scence intensities of LuAG:Ce-PiTA and 50 L&10C-PiTA only decrease by 5.35%and 3.28%,respectively,in the 24 h illumination aging decay test of the reflective laser module.The results confirm the suitability of the optimally designed TA substrate for LuAG:Ce color converter applications in high-power reflective laser illumination.展开更多
A novel Eu^(3+)-doped fluorapatite red phosphor Ca_(2)Y_(8)(BO_(4))_(2)(SiO_(4))_(4)F_(2)Eu^(3+)with pure phase was synthesized in this study.Density functional theory(DFT)calculation and diffuse reflection spectrum a...A novel Eu^(3+)-doped fluorapatite red phosphor Ca_(2)Y_(8)(BO_(4))_(2)(SiO_(4))_(4)F_(2)Eu^(3+)with pure phase was synthesized in this study.Density functional theory(DFT)calculation and diffuse reflection spectrum analysis reveal its potential as a matrix for phosphors excited by ultraviolet light.Eu^(3+)has a^(7)F_(0)→^(5)L_(6)transition at 394 nm,and the prepared phosphor exhibits a high emission intensity at 614 nm,which may be attributed to the^(5)D_(0)-^(7)F_(2)energy transition at the lower symmetry site of Eu^(3+).The optimal doping concentration of the phosphor is determined to be 11 mol%,with concentration quenching attributed to the exchange interaction mechanism.The overall color purity of the phosphor is up to 99.88%,with an internal quantum efficiency as high as 91.15%.Notably,Ca_(2)Y_(8)(BO_(4))_(2)(SiO_(4))_(4)F_(2):11 mol%Eu^(3+)(CYBSF:11 mol%Eu^(3+))phosphors exhibit good thermal stability,with a thermal quenching temperature(T1/2)of 552 K and the intensity of emission at 423 K still at 88.89%of that at 298 K.The activation energy of the phosphor is up to 0.30287 eV.Its comprehensive luminescence performance surpasses that of commercial red phosphor,making it suitable for near ultraviolet excited warm white light emitting diode(NUV-WLED)with a high color rendering index(Ra=82)and a correlated color temperature(CCT)of 4339 K.Moreover,the phosphor achieves latent fingerprint visualization and anti-counterfeiting ink on different material surfaces:glass,aluminum foil,plastic and paper.Overall,the fluorapatite CYBSF:11 mol%Eu^(3+)phosphor holds great potential for multimodal applications due to its high quantum efficiency and good thermal stability.展开更多
文摘Phosphor-in-glass(PiG)has been prepared into various types of phosphor films owing to its simplicity process,exceptional color purity,and convenient color adjustability.Nevertheless,existing reflective PiGs films have encountered limitations in terms of stability and feasibility as reliable color converters,mainly attributed to issues related to thermal deposition and insufficient optical efficiency.Herein,we propose to use AlN substrate with superior thermal conductivity to coat the TiO_(2) layer to obtain TiO_(2)-AlN(TA),which enhances the reflectivity of blue light to facilitate the light conversion process.By incorporating highly thermally stable LuAG:Ce-PiGs on a TA substrate,the LuAG:Ce-PiTA converter exhibits a luminous flux of 1102 lm@6.4 W,and maintains a relative intensity of 94.6%at 473 K benefiting from the high thermal conductivity of 34.1 W/(m·K).The addition of CASN_(3):Eu to the color converter 50 L&10C-PiTA enables an impressive CRI of 90.7.Relative lumine scence intensities of LuAG:Ce-PiTA and 50 L&10C-PiTA only decrease by 5.35%and 3.28%,respectively,in the 24 h illumination aging decay test of the reflective laser module.The results confirm the suitability of the optimally designed TA substrate for LuAG:Ce color converter applications in high-power reflective laser illumination.
基金supported by the National Natural Science Foundation of China(52372013)Natural Science Foundation of Shanghai(22ZR1460600)。
文摘A novel Eu^(3+)-doped fluorapatite red phosphor Ca_(2)Y_(8)(BO_(4))_(2)(SiO_(4))_(4)F_(2)Eu^(3+)with pure phase was synthesized in this study.Density functional theory(DFT)calculation and diffuse reflection spectrum analysis reveal its potential as a matrix for phosphors excited by ultraviolet light.Eu^(3+)has a^(7)F_(0)→^(5)L_(6)transition at 394 nm,and the prepared phosphor exhibits a high emission intensity at 614 nm,which may be attributed to the^(5)D_(0)-^(7)F_(2)energy transition at the lower symmetry site of Eu^(3+).The optimal doping concentration of the phosphor is determined to be 11 mol%,with concentration quenching attributed to the exchange interaction mechanism.The overall color purity of the phosphor is up to 99.88%,with an internal quantum efficiency as high as 91.15%.Notably,Ca_(2)Y_(8)(BO_(4))_(2)(SiO_(4))_(4)F_(2):11 mol%Eu^(3+)(CYBSF:11 mol%Eu^(3+))phosphors exhibit good thermal stability,with a thermal quenching temperature(T1/2)of 552 K and the intensity of emission at 423 K still at 88.89%of that at 298 K.The activation energy of the phosphor is up to 0.30287 eV.Its comprehensive luminescence performance surpasses that of commercial red phosphor,making it suitable for near ultraviolet excited warm white light emitting diode(NUV-WLED)with a high color rendering index(Ra=82)and a correlated color temperature(CCT)of 4339 K.Moreover,the phosphor achieves latent fingerprint visualization and anti-counterfeiting ink on different material surfaces:glass,aluminum foil,plastic and paper.Overall,the fluorapatite CYBSF:11 mol%Eu^(3+)phosphor holds great potential for multimodal applications due to its high quantum efficiency and good thermal stability.
