Eu^(3+)-activated red phosphors are popular for their classic^(5)D_(0)→^(7)F_(J)(J=0,1,2,3,4)emission characteristics.However,the weak emission of the^(5)D_(0)→^(7)F_(4)transition and the concentration quenching cau...Eu^(3+)-activated red phosphors are popular for their classic^(5)D_(0)→^(7)F_(J)(J=0,1,2,3,4)emission characteristics.However,the weak emission of the^(5)D_(0)→^(7)F_(4)transition and the concentration quenching caused by energy migration have become the main obstacles to achieving strong far-red emission.Herein,we report a novel Ba_(3)Sc_(1-x)(BO_(2))9:xEu^(3+)phosphor that simultaneously enhances 5D0→7F4 emission and suppresses quenching through size confinement and low phonon energy.A Sr^(2+)→Ba^(2+)substitution strategy optimizes luminescence,achieving 1.56-fold intensity enhancement and improved quantum efficiency(IQE:83%→92%;EQE:38%→40%).The improvement mechanism was revealed through the local coordination distortion of Eu^(3+)and the change of the band gap when Sr and Ba coexist.Structural analysis reveals enhanced thermal stability(423 K:86%→97%;483 K:78%→95%)originates from increased lattice rigidity.Abnormal thermal quenching(303-363 K)is white light-emitting diodes(WLEDs)device prepared based on Ba_(2.80)Sr_(0.20)Eu(BO_(2))_(9)phosphor shows a color temperature of 4532 K and a color rendering index of 91.6.This article also explores three applications of plant growth,latent fingerprint visualization,and anticounterfeiting QR code.This finding provides a reference for further exploring the design of high concentration quenching and efficient far-red emitting phosphors.展开更多
基金financially supported by Jilin Scientific and Technological Development Programs(No.20250102156JC)
文摘Eu^(3+)-activated red phosphors are popular for their classic^(5)D_(0)→^(7)F_(J)(J=0,1,2,3,4)emission characteristics.However,the weak emission of the^(5)D_(0)→^(7)F_(4)transition and the concentration quenching caused by energy migration have become the main obstacles to achieving strong far-red emission.Herein,we report a novel Ba_(3)Sc_(1-x)(BO_(2))9:xEu^(3+)phosphor that simultaneously enhances 5D0→7F4 emission and suppresses quenching through size confinement and low phonon energy.A Sr^(2+)→Ba^(2+)substitution strategy optimizes luminescence,achieving 1.56-fold intensity enhancement and improved quantum efficiency(IQE:83%→92%;EQE:38%→40%).The improvement mechanism was revealed through the local coordination distortion of Eu^(3+)and the change of the band gap when Sr and Ba coexist.Structural analysis reveals enhanced thermal stability(423 K:86%→97%;483 K:78%→95%)originates from increased lattice rigidity.Abnormal thermal quenching(303-363 K)is white light-emitting diodes(WLEDs)device prepared based on Ba_(2.80)Sr_(0.20)Eu(BO_(2))_(9)phosphor shows a color temperature of 4532 K and a color rendering index of 91.6.This article also explores three applications of plant growth,latent fingerprint visualization,and anticounterfeiting QR code.This finding provides a reference for further exploring the design of high concentration quenching and efficient far-red emitting phosphors.
