Design, Synthesis, and Characterization of a Novel Blue-Green Long Afterglow BaYAl3O7:Eu2+, Nd3+ Phosphor and Its Anti-Counterfeiting Application

Herein, a series of novel long afterglow nanophosphors BaYAl3O7:Eu2+, Nd3+ was synthesized by the combustion method. The investigation encompassed the characterization of X-ray diffraction, morphology, chemical valence, elemental composition, and photoluminescence behavior of BaYAl3O7:Eu2+ and BaYAl3O7:Eu2+, Nd3+ nanoparticles. Under 365 nm excitation, BaYAl3O7:Eu2+ and BaYAl3O7:Eu2+, Nd3+ show emission bands centered at 497 nm and 492 nm, which are attributed to the 4f65d→4f7 transition of Eu2+ ions. The optimal samples of BaYAl3O7:0.03Eu2+ and BaYAl3O7:0.03Eu2+, 0.02Nd3+ have average fluorescence lifetimes of 850 ns and 1149 ns, respectively. The co-doping of Nd3+ ions as the trap centers produced long afterglow luminescence properties, and the afterglow time could reach up to 8 min. Furthermore, the fluorescent powder can be mixed with polyacrylic acid to prepare anti-counterfeiting inks; a clover pattern and snowflake pattern have been successfully printed using screen printing technology, proving its potential application in the field of anti-counterfeiting.

Cyan Broad-Band Emission Phosphor with Scandium Silicon Multiple-Ring Structure for White Light-Emitting Diodes and Field Emission Displays

Silicate phosphor KBaScSi₂O₇:Ce³⁺ (KBSS:Ce³⁺), as a novel material, has been prepared by the solid-state method in this study. The crystal structure, luminescent properties, thermal stability, and cathodoluminescence (CL) properties of this material were analyzed systematically. It concludes that the phosphor can emit cyan light with emission peak at 509 nm under n-UV light excitation (300-400 nm). By coating KBSS:Ce³⁺ with a red-emitting CaAlSiN₃:Eu²⁺ on a n-UV (365 nm) light-emitting diode (LED) chip, the intense warm white light with high R_A (83.4) and low CCT (3652) can be produced under a 350 mA forward bias current.In addition, the CL performance shows that KBSS:0.10Ce³⁺ has high saturation current and voltage and good color stability under low voltage conditions. All these results indicate that KBSS:Ce³⁺ phosphor will be very promising in LED and field emission display applications.

Crystal structure, luminescence properties and thermal stability of BaY2−xEuxGe3O10 phosphors with high colour purity for blue-excited pc-LEDs

The luminescence properties of reddish-orange emitting BaY_2−xEu_xGe₃O₁₀ phosphors crystallizing in the monoclinic system (S.G. P2₁/m) have been discussed in detail. The studied germanates are appropriate for applications in high-powered pc-LEDs.

Structural, electronic, and optical studies of BaRE2Ge3O10 (RE = Y, Sc, Gd–Lu) germanates with a special focus on the [Ge3O10]8− geometry

A new series of BaRE₂Ge₃O₁₀ trigermanates crystallizing in the monoclinic system (S.G. P2₁/m) has been characterized by various methods.

Investigation of local structure distortion and electron cloud interaction on emission-band broadening induced by the concentration perturbation effect of cation substitution in BaY2Si3O10:Eu phosphors

Here, we conceived a concentration perturbation effect to obtain cyan-emitting phosphors based on local structure distortion and electron cloud interaction.

Control of the photoluminescence in Ba0.97Y2Si3O10:Eu2+ phosphors via the intensification effect of the second luminescence centre

A method is reported that broadens the FWHMs of the emission spectra of Ba_0.97Y₂Si₃O₁₀:0.03Eu²⁺ by intensifying the second emission peak.

Design, synthesis and characterization of a novel bluish-green long-lasting phosphorescence phosphor BaLu2Si3O10:Eu2+, Nd3+

A newly proposed bluish-green emitting long-lasting phosphor, BaLu₂Si₃O₁₀:Eu²⁺, Nd³⁺, with prominent LLP properties is successfully achieved via a high temperature solid state method.

Photoluminescence properties of novel BaGd2Si3O10:RE2+/3+ (RE = Eu or Ce) phosphors with trichromatic emission for white LEDs

Novel phosphors BaGd₂Si₃O₁₀:RE^2+/3+ (RE = Eu or Ce) were designed and prepared by a solid state reaction.