Optical and Band Gap Study of Violet-Blue Broadband Emitting Dy Codoped YSiO:Ce Phosphor for nUV White Light-Emitting Diodes.

YSiO:Ce, YSiO:Dy, and YSiO:Ce and Dy phosphors were successfully synthesized using the oxalate wet chemical method. Phase purity, emission and excitation spectra, FTIR, and the chromaticity coordinate were adopted to represent the performance of the samples. The photoluminescence (PL) spectrum YSiO:Ce and Dy phosphor shows a broadband in violet-blue region with a bandwidth of nearly 75 nm due to combine effect of Ce-Dy ions with another emission peaks of Dy ions peaking at 574 nm.

Photoluminescence properties of Pb(PO)Br:RE (RE = Dy, Eu and Tb) phosphor synthesised using solid-state method.

This study describes the luminous properties of Pb(PO)Br doped with RE (RE = Dy, Eu and Tb) synthesised using the solid-state method. The synthesised phosphor was characterised using Fourier-transform infrared, X-ray diffraction, scanning electron microscopy and photoluminescence measurements. Dy-doped Pb(PO)Br phosphor exhibited blue and yellow emissions at 480 and 573 nm, respectively, on excitation at 388 nm.

Structural, morphological, and photoluminescence properties of RE (RE = Dy , Eu , Sm )-doped CaAlBO phosphor synthesized by combustion method.

The CaAlBO :RE (RE = Dy , Eu , Sm ) phosphor were prepared via combustion synthesis and studied by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) analysis, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), photoluminescence (PL) spectra and CIE coordinates. The phase formation of the obtained phosphor was analyzed by XRD and the result was confirmed by standard PDF Card No. 1539083.

Intensity enhancement of photoluminescence in Tb /Eu co-doped Ca Zn Al O phosphor for WLEDs.

This article focuses on the effect of monovalent cation doping on the optical properties of rare earth (RE = Eu , Tb ) co-doped Ca Zn Al O which has been synthesized by a low temperature combustion method. Crystalline phase of the Ca Zn Al O phosphor was examined and confirmed by X-ray diffraction measurement. Under near-ultraviolet light excitation Eu -doped Ca Zn Al O phosphor exhibit characterization of Eu emission bands that are located at a maximum wavelength (λ ) of approximately 470 nm and other peaks centred at 593 nm and 615 nm, respectively.

Luminescence properties of MgCaAl O :RE (RE = Sm ,Dy ) phosphor for eco-friendly solid-state lighting applications.

Different concentrations of rare earth Sm - and Dy -activated MgCaAl O phosphors were synthesized using the combustion route and their detailed luminescence investigations are reported in this paper. The photoluminescence excitation spectra of Sm - and Dy -activated MgCaAl O phosphor show multiple peaks in the ultraviolet light region of the electromagnetic spectrum. The characteristic emission spectra of the MgCaAl O :Sm phosphor are located at 563 nm, 594 nm, and 644 nm, with the maximum emission intensity occurring at 594 nm.

Wet chemical synthesis of BiPO :Eu phosphor for w-LED application.

The synthesis of BiPO :Eu phosphors has been achieved via a wet chemical process. X-ray diffraction patterns show that the phase of the as-prepared samples matches very well with the standard BiPO structure. At 395 nm, the highest excitation intensity was observed.

Luminescence characterization of KBaPO :RE (RE = Sm ,Eu ,Dy ) phosphors.

KBaPO luminescent powdered phosphors doped with rare earth elements (RE = Sm ,Eu ,Dy ) were successfully synthesized using a wet chemical method to identify the most suitable phosphor for solid-state lighting based on the measurement of their emission spectra at excitation wavelengths. The X-ray diffraction pattern of the as-prepared KBaPO was well matched with its standard JCPDS file no. 330996, indicating the formation of the desired compound.

Synthesis and photoluminescence properties of Eu -activated Ba Mg(PO ) phosphor.

In this paper, we have reported the photoluminescence (PL) properties of the Ba Mg(PO ) :Eu phosphor synthesized using a wet chemical method. The preliminary scanning electron microscopy (SEM) investigation of the sample revealed irregular surface morphology with particle sizes in the 10-50 μm range. The strongest PL excitation peak was observed at 396 nm.

Photoluminescence properties of Ca Al O :RE (RE = Eu, Dy and Tb) phosphors for solid state lighting.

Ca Al O :Eu , Ca Al O :Dy and Ca Al O :Tb phosphors were synthesized using a combustion synthesis method. The prepared phosphors were characterized by X-ray powder diffraction for phase purity, by scanning electron microscopy for morphology, and by photoluminescence for emission and excitation measurements. The Ca Al O :Eu phosphors could be efficiently excited at 396 nm and showed red emission at 594 nm and 616 nm due to D  →  F and D  →  F transitions.

Luminescence investigation of novel MgPbAl₁₀O₁₇:Tb³⁺ green-emitting phosphor for solid-state lighting.

In this work, we studied the luminescence properties of Tb(3+)-doped MgPbAl10O17 green phosphor. To understand the excitation mechanism and corresponding emission of the prepared phosphor, its structural, morphological and photoluminescence properties were investigated. In general, for green emission, Tb(3) is used as an activator and the obtained excitation and emission spectra indicated that this phosphor can be effectively excited by a wavelength of 380 nm, and exhibits bright green emission centered at 545 nm corresponding to the f → f transition of trivalent terbium ions.

Synthesis and characterization of blue long-lasting BaCa2Al8O15:Eu2+, Dy3+ phosphor.

We have synthesized and characterized a new BaCa2Al8O15:Eu(2+),Dy(3+) phosphor prepared by the combustion method. X-ray diffraction, thermoluminescence, scanning electron microscope, time decay and optical spectral analysis photoluminescence excitation, emission spectra were used to characterize the phosphors. Broadband ultraviolet excited luminescence of the BaCa2Al8O15:Eu(2+),Dy(3+) was observed in the blue region (λ(max) = 435 nm) due to transitions from the 4f(6)5d(1) to the 4f(7) configuration of the Eu(2+) ion.

Combustion synthesis of blue-emitting submicron CaAl4O7:Eu2+, Dy3+ persistence phosphor.

Long persistence phosphor CaAl4O7:Eu(2+), Dy(3+) were prepared by a combustion method. The phosphors were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), decay time measurement techniques and photoluminescence spectra (PL). The CaAl4O7:Eu(2+), Dy(3+) phosphor showed a broad blue emission, peaking at 445 nm when excited at 341 nm.