Photoluminescence characteristics of novel Sm3+ ions-doped La1.4 Al22.6 O36 phosphor for n-UV w-LED.

The combustion procedure was used to synthesize La1.4 Al22.6 O36 :Sm3+ phosphors. The X-ray diffraction (XRD) patterns and morphological and photoluminescence properties were investigated. The XRD patterns consisted of a hexagonal crystal structure. At 405 nm, the maximum excitation intensity was obtained. Following 405 nm excitation, three different emission peaks at 573, 604, and 651 nm were seen. Concentration quenching occurred at 1.5 mol% Sm3+ ions. The Commission Internationale de l'éclairage coordinates for the La1.4 Al22.6 O36 phosphor with Sm3+ doping were 604 nm (x = 0.644, y = 0.355) falling in the red region. The findings implied that the prepared phosphor may be used to develop w-light-emitting diodes.

Wet chemical synthesis of BiPO4 :Eu3+ phosphor for w-LED application.

The synthesis of BiPO4 :Eu3+ 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 BiPO4 structure. At 395 nm, the highest excitation intensity was observed. Following 395 nm excitation, two characteristic emission peaks at 592 nm and 616 nm were shown. At 0.5 mol% of Eu3+ ions, concentration quenching occurred. The particle size is within the micrometre range, according to the scanning electron microscope magnification. The chromaticity coordinates for wavelengths 592 nm and 616 nm are (x = 0.586, y = 0.412) and (x = 0.682, y = 0.317), respectively. The findings imply that the prepared phosphor may be used to create white light-emitting diodes.

Luminescence properties of MgCaAl10 O17 :RE3+ (RE3+ = Sm3+ ,Dy3+ ) phosphor for eco-friendly solid-state lighting applications.

Different concentrations of rare earth Sm3+ - and Dy3+ -activated MgCaAl10 O17 phosphors were synthesized using the combustion route and their detailed luminescence investigations are reported in this paper. The photoluminescence excitation spectra of Sm3+ - and Dy3+ -activated MgCaAl10 O17 phosphor show multiple peaks in the ultraviolet light region of the electromagnetic spectrum. The characteristic emission spectra of the MgCaAl10 O17 :Sm3+ phosphor are located at 563 nm, 594 nm, and 644 nm, with the maximum emission intensity occurring at 594 nm. The emission spectra of the MgCaAl10 O17 :Dy3+ phosphor show two emission peaks, one at 476 nm wavelength in the blue light region and the other at 573 nm wavelength in the yellow region. The above results suggest that the prepared phosphor can be suitable for applications in eco-friendly solid-state lighting.

Photoluminescence properties of Ca2 Al2 O5 :RE3+ (RE = Eu, Dy and Tb) phosphors for solid state lighting.

Ca2 Al2 O5 :Eu3+ , Ca2 Al2 O5 :Dy3+ and Ca2 Al2 O5 :Tb3+ 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 Ca2 Al2 O5 :Eu3+ phosphors could be efficiently excited at 396 nm and showed red emission at 594 nm and 616 nm due to 5 D0  â†’ 7 F1 and 5 D0  â†’ 7 F2 transitions. Dy3+ -doped phosphors showed blue emission at 482 nm and yellow emission at 573 nm. Ca2 Al2 O5 :Tb3+ phosphors showed emission at 545 nm when excited at 352 nm. Concentration quenching occurred in both Eu3+ and Dy3+ phosphors at 0.5 mol%. Photoluminescence results suggested that the aluminate-based phosphor could be a potential candidate for application in environmentally friendly based lighting technologies.