Coordination chemistry of the host matrices with dopant luminescent Ln3+ ion and their impact on luminescent properties

A potential red-emitting phosphor Ca2YTaO6:Eu3+: Luminescence properties, thermal stability and applications for white LEDs

At present, rare-earth-activated perovskite-type materials have attracted lots of interest from researchers owing to their excellent advantages of unique electron properties and stable structure. This present work was designed to synthesize, investigate, and compare the photoluminescence properties in europium(III) (Eu³⁺)-activated Ca₂BB′O₆ (B = Y, Gd, and La; B′ = Sb and Nb) double-perovskite (A₂BB′O₆) luminescent materials. The doped Eu³⁺ ions substitute the B sites of Y³⁺, Gd³⁺, and La³⁺ ions, which are distributed to the equilibrium valence state and exhibit little difference in ion radius among them. All the resultant samples have a monoclinic structure, and the B sites strongly affect the space group in double-perovskite Ca₂BB′O₆ frameworks. Additionally, the emission intensity, thermal stability, decay curve, color purity, quantum yield (QY), etc. were determined. The Ca₂BNbO₆:Eu³⁺ (B = Y, Gd, and La) frameworks have good QYs (>42%), which are promising for white-light-emitting diodes (WLEDs). Besides, the red-emitting Ca₂BB′O₆:Eu³⁺–polydimethylsiloxane (PDMS) and white-emitting CYN0.1Eu³⁺–commercial phosphors (CP)–PDMS films were fabricated. Eventually, the packaged WLEDs based on the Ca₂BNbO₆:Eu³⁺ (B = Y, Gd, and La) powders and a novel white-emitting structure based on the CYN:0.1Eu³⁺–CP–PDMS film were confirmed to have suitable color rendering index and correlated color temperature values for indoor illumination.

Advantageous Occupation of Europium(III) in the B Site of Double-Perovskite Ca2BB′O6(B = Y, Gd, La; B′ = Sb, Nb) Frameworks for White-Light-Emitting Diodes

The Dy3+ doped (Lu,Gd)3Al5O12 garnet phosphors with spherical morphology were obtained via homogeneous precipitation method, followed by calcination at 1100 °C. The particle morphology does not change significantly, but can be controlled by adjusting the urea content. The synthesis, structure, luminescent properties of precursor and resultant particles were analyzed by the combined technologies of XRD, FE-SEM, PLE/PL decay behavior. The (Lu0.975Dy0.025)AG phosphors display strong blue and yellow emission at ~481 nm (4F9/2 → 6H15/2 transition of Dy3+) and ~582 nm 4F9/2 → 6H13/2 transition of Dy3+), respectively. The phosphors have similar color coordinate and temperature of (~0.33, ~0.34), ~5517 K, respectively, which are closed to the white emission. The particle size and luminescent intensity decreased while the lifetime increased with the urea concentration increasing. The Gd3+ addition does not alter the shape/position of emission peaks, but enhance the blue and yellow emission of Dy3+ owing to the efficient Gd3+ → Dy3+ energy transfer. The [(Lu1-xGdx)0.975Dy0.025]3Al5O12 phosphors are expected to be widely used in the lighting and display areas.

Enhanced Dy3+ white emission via energy transfer in spherical (Lu,Gd)3Al5O12 garnet phosphors.

Luminescence properties of novel Eu3+-doped tantalate NaCaTiTaO6 red-emitting phosphors for solid-state lighting

In situ preparation of Al@3-Perfluorohexyl-1, 2-epoxypropane@glycidyl azide polymer (Al@PFHP@GAP) high-energy material

Spherical engineering and space-group dependent luminescence behavior of YBO 3 :Eu 3+ red phosphors

Preparation and characterization of core-shell Al@PFHP with improving the combustion and ignition properties of aluminum powder

Facile energetic fluoride chemistry induced organically coated aluminum powder with effectively improved ignition and combustion performances

Uniform colloidal spheres for RE 3 BO 6 (RE = Eu-Yb, Y) and excitation-dependent luminescence of Y 3 BO 6 :Eu 3+ red phosphor

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In situ preparation of Al@3-Perfluorohexyl-1, 2-epoxypropane@glycidyl azide polymer (Al@PFHP@GAP) high-energy material

Spherical engineering and space-group dependent luminescence behavior of YBO 3 :Eu 3+ red phosphors

Preparation and characterization of core-shell Al@PFHP with improving the combustion and ignition properties of aluminum powder

Facile energetic fluoride chemistry induced organically coated aluminum powder with effectively improved ignition and combustion performances

Uniform colloidal spheres for RE 3 BO 6 (RE = Eu-Yb, Y) and excitation-dependent luminescence of Y 3 BO 6 :Eu 3+ red phosphor