Colorful Ultralong Room Temperature Phosphorescent Afterglow with Excitation Wavelength Dependence Based on Boric Acid Matrix
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Abstract Room temperature phosphorescent (RTP) materials have triggered wide interests because of their excellent performance and various promising applications. However, conventional RTP materials possessing color‐tunable and ultralong afterglow often suffer from low phosphorescent emission efficiency. Herein, a long lifetime and high‐efficiency RTP emission system composed of boric acid as the host matrix and organic phosphors as guest molecules is constructed by suppressing the non‐radiative transition process and promoting the triplet exciton of the phosphors. The synergistic effect of the physically limited domain and supramolecular anchoring also contributes to the ultralong lifetime (up to 1.85 s) and high phosphorescence quantum yield (up to 53%). The afterglow can be visually observed for 30 s. With a large overlap of π ‐conjugated chromophores, the emission peak of RTP redshifted, realizing cyan, green, and red afterglow in the monochromatic domain. In addition, the emission of colorful afterglow and white afterglow is adjustable with the different co‐doping ratios. Finally, the application of RTP materials to anti‐counterfeiting encryption is demonstrated.Keywords:
Cyan
Cyan
Luminous efficacy
Emission intensity
Fade
Quantum Efficiency
Color temperature
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Persistent luminescence
Emission intensity
Trap (plumbing)
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Persistent luminescence
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Cyan
Ultraviolet
Ultraviolet light
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Cyan
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Cyan
Green-light
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SrA2O4: Eu,Dy long afterglow luminescence powders are synthesized by the traditional ceramic synthesis method. The excitation peaks lie in 320nm and 360nm, and the emission peak lies in 520nm, the afterglow time may reach above 8h. Employed the low melt point B-Si glass as the matrix, doped the luminescence materials, and prepared the long afterglow luminescence glass. The results indicated the sintered temperature had great influence on the luminescent properties of the glass, as the temperature increasing, the luminescent intensity and the afterglow time decreased.
Persistent luminescence
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Afterglow luminescence has garnered significant attention due to its excellent optical properties. Currently, most afterglow phenomena are produced by persistent luminescence following cessation of the excitation light. However, it remains a challenge to control the afterglow luminescence process due to rapid photophysical or photochemical changes. Here, we develop a new strategy to control the afterglow luminescence process by introducing pyridones as singlet oxygen (1O2) storage reagents (OSRs), where 1O2 can be stored in covalent bonds at relatively low temperatures and released upon heating. The afterglow luminescence properties, including afterglow intensity, decay rate, and decay process, can be tuned flexibly by regulating temperature or OSR structures. Based on the controllable luminescence properties, we devise a new strategy for information security. We believe that such an excellent luminescent system also holds remarkable potential for applications in many other fields.
Persistent luminescence
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To overcome the problem that Bi3+-activated phosphors suffer from, it is an urgent need to realize narrow-band light emission of Bi3+-activated phosphors, which not only improves their luminescence characteristics, but also increases their competitiveness with rare earth-activated commercial phosphors. In our work, a novel Bi3+-activated narrow-band cyan phosphor has been achieved in a highly condensed and symmetrical crystal structure of Ca3Lu2Ge3O12, and its full width of half-maximum (fwhm) of the emission band reaches 47 nm. The result indicates that Bi3+-activated Ca3Lu2Ge3O12 is comparative to the commercial green phosphor β-sialon: Eu2+ (fwhm ≈ 55 nm), and its strong excitation band locates at 390 nm, implying that Ca3Lu2Ge3O12: Bi3+ can be well excited by near-ultraviolet (NUV) LED chips. Furthermore, Ca3Lu2Ge3O12: Bi3+ possesses promising cathodoluminescence properties accompanied by good antiaging characteristics. The fascinating PL and CL properties of Ca3Lu2Ge3O12: Bi3+ have been proved to relate to their garnet-type structure; thus, the structure–property relations of Bi3+-activated Ca3Lu2Ge3O12 were discussed in detail in this work, which may provide an effective way for exploring better Bi3+-activated phosphors for use in WLEDs and FEDs.
Cyan
Cathodoluminescence
Field emission display
Chromaticity
Bismuth
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The long afterglow luminescence powders of Eu2+ and Dy3+ activated SrAl2O4 were synthesized by solid-state reactions under a weak reductive atmosphere.The long afterglow luminescence glass were synthesized by SrAl2O4:Eu2+,Dy3+long afterglow luminescence powders and low melting point PbOZnO-B2O3-SiO2 glass,and systematically characterized by photoluminescence excitation and emission spectra and the concentration of the long afterglow luminescence powders,etc.The results of experiments show that the long afterglow luminescence glass maintained the phosphorescence properties of SrAl2O4:Eu2+,Dy3+ long afterglow luminescence powders.After the irradiation with ultraviolet light,the long afterglow luminescence glass emitted yellowish-green long-lasting phosphoresecence(LLP) with a spectrum peaking at about 520 nm ascribed to the characteristic 4f65d1→4f7 transition of Eu2+.As the luminescence powders concentrations at 30 %,the long afterglow luminescence glass with high brightness and long persistent phosphorescence were obtained under the temperature of the experiment.With the melt temperature increasing,the luminescent intensity and the afterglow time of the long afterglow luminescence glass decreased.
Persistent luminescence
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