Intensity enhancement of photoluminescence in Tb³⁺/Eu³⁺ co‐doped Ca₁₄Zn₆Al₁₀O₃₅ phosphor for WLEDs

Abstract

This article focuses on the effect of monovalent cation doping on the optical properties of rare earth (RE = Eu3+, Tb3+) co‐doped Ca14Zn6Al10O35 which has been synthesized by a low temperature combustion method. Crystalline phase of the Ca14Zn6Al10O35 phosphor was examined and confirmed by X‐ray diffraction measurement. Under near‐ultraviolet light excitation Eu3+‐doped Ca14Zn6Al10O35 phosphor exhibit characterization of Eu3+ emission bands that are located at a maximum wavelength (λmax) of approximately 470 nm and other peaks centred at 593 nm and 615 nm, respectively. With Tb3+‐doped Ca14Zn6Al10O35 phosphor showing a green emission band centred at 544 nm under near‐ultraviolet range. Furthermore, we studied the energy transfer process in Eu3+/Tb3+pair and enhancement in photoluminescence (PL) intensity with doping different charge compensation. Here we obtained the optimum PL emission intensity of the phosphor in broad and intense visible spectral range which may be significant for the fabrication of white light emitting diodes (WLEDs).

Designing dual-emission phosphors for temperature warning indication and dual-mode luminescence thermometry

“…Four dominant emission peaks centered at 491 nm ( 5 D 4 → 7 F 5 ), 543 nm ( 5 D 4 → 7 F 5 ), 586 nm ( 5 D 4 → 7 F 4 ), and 623 nm ( 5 D 4 → 7 F 3 ), respectively, originating from the characteristic 4f–4f transition of Tb 3+ , are present in the PL spectrum of Tb 3+ single-doped SGLT when excited by 354 nm. 42 Fig. 5(c) exhibits the PL excitation and emission spectra of Tb 3+ and Mn 4+ co-doped SGLT phosphors.…”

Study synthetic method, photoluminescence mechanism and optimistic applications of KAlSiO 4 Phosphor

“…when excited by 395 nm, spectra reveal that broad bands extend from 410 nm to 575 nm were optimum obtained at 436 nm, as well as two emissions bands at 593 nm and 614 nm. The broadband is caused by 4 F6 -5 D1 4 F7 transitions, while the sharp emissions peaked at 593 nm and 613 nm are caused by 7 F0 → 5 D1 and 7 F0 → 5 D2 transitions, correspondingly [21]. For excitation 465 nm, no broad band was observed but two important peaks were observed, the first emission peak is located at 593 nm corresponding to the 5 D0 → 7 F1 transition, and another intense peak is located at 613 nm which can be associated with the 5 D0 → 7 F2 transition of Eu 3+ ion.…”

“…This rare earth-doped inorganic phosphor has several advantages in comparison over conventional Tungston base lamps as well as compact fluorescent lamps with high luminous efficiency, cheap to manufacture, high life span, magnificent thermal stability, high color temperature, and less color rendering index. All this property is inorganic based phosphor becomes widely applicable for Light emitting diode (LEDs), solid-state lasers, solar panels, and sensors [1][2][3].…”

Colour-tunable features in thermally stable Tb3+/Eu3+ co-doped telluro tungstate glasses for photonic applications

“…In recent years, the transition metal or rare-earth ions (REIs) incorporated crystalline/non-crystalline materials have been attained enormous consideration in innovative technologies unique properties such as homogenous light emitting capacity, easy process of fabrication, outstanding thermal stability, cheap production cost and better solubility [7]. Crystalline (i.e., phosphor) materials have been used to fabricate commercial white LEDs.…”