Intense green‐, red‐emitting Tb³⁺, Tb³⁺/Bi³⁺‐doped and Sm³⁺, Sm³⁺/La³⁺‐doped Ca₂Al₂SiO₇ phosphors

Abstract

This paper focuses on an optical study of a Tb 3+ /Bi 3+ -doped and Sm 3+ /La 3+ -doped Ca 2 Al 2 SiO 7 phosphor synthesized using combustion methods. Here, Ca 2 Al 2 SiO 7 :Sm 3 + showed a red emission band under visible light excitation but, when it co-doped with La 3+ ions, the emission intensity was further enhanced. Ca 2 Al 2 SiO 7 :Tb 3+ shows the characteristic green emission band under near-ultraviolet light excitation wavelengths, co-doping with Bi 3+ ions produced enhanced photoluminescence intensity with better colour tunable properties. The phosphor exhibited better phase purity and crystallinity, confirmed by X-ray diffraction. Binding energies of Ca(2p), Al(2p), Si(2p), O(1s) were studied using X-ray photoelectron spectroscopy. The reported phosphor may be a promising visible light excited red phosphor for light-emitting diodes and energy conversion devices. K E Y W O R D SLn 3+ ions, combustion synthesis, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopyphotoluminescence

Photoluminescence performance of green light emitting terbium (III) complexes with β‐hydroxy ketone and nitrogen donor ancillary ligands

“…Therefore, the complexes are considered as green color emitter in fabrication of WLEDs. [ 41 ] The values of p c for these complexes turn out to be greater as compared to already discussed luminescent materials in the literature. [ 42,43 ]…”

Investigations into spectroscopic and optoelectronic behaviour of furoic acid‐based Eu(III) complexes for advanced photonic applications

“…The spectral profiles of synthesized complexes showed dynamic changes in comparison with the free ligand and ancillary ligand, due to the paramagnetic behaviour of Eu(III) ions. [ 16 ] 1 H NMR spectra of the ligand exhibited a single peak at 11.08 ppm due to acidic protons, a singlet at 7.71 ppm and a doublet at 7.80 ppm due to methylene protons of the phenyl ring and two doublets at 7.34 ppm and 7.47 ppm due to two methylene protons of the furan ring. [ 17 ] The complexation of metal ions with the ligand was confirmed as the specific peak of acidic proton was absent in complexes C1–C4.…”