Enhancement of luminescence intensity and spectroscopic analysis of Eu3+-activated and Li+ charge-compensated CaTiO3 color tunable phosphors for solid-state lighting

Singh, Dhananjay; Baitha, Pankaj Kr.; Manam, J.

doi:10.1007/s00339-016-0201-x

Cited by 25 publications

(12 citation statements)

References 41 publications

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“…The recent trend toward the enhancement of luminescence properties of lanthanide doped inorganic phosphors witnessed alkali metal ion (Li + , Na + , K + ) incorporation in the phosphor system as a strategic step for increasing the efficiency of the existing phosphors. Among them, the consequence of Li + incorporation has been studied extensively for both down-conversion and up-conversion luminescence in various host matrices. ,− However, to the best of our knowledge, the effect of Li + substitution in the ZnAl 2 O 4 :Eu 3+ phosphor has not been explored yet. To bridge the aforementioned void, herein we report the effect of Li + co-doping on the PL properties of Eu 3+ doped ZnAl 2 O 4 nanophosphors for red LED applications.…”

Section: Introductionmentioning

confidence: 99%

ZnAl₂O₄:Eu³⁺ Nanoparticle Phosphors Co-doped with Li⁺ for Red Light-Emitting Diodes

Samanta

Dey

et al. 2021

ACS Appl. Nano Mater.

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In recent years, rare-earth doped phosphors have gathered immense attention in the luminescence field for lighting and electronic display applications. However, the unavailability of an efficient and low-cost red phosphor is a major challenge for the widespread deployment of white light-emitting diodes (WLEDs) for practical purposes. Here we report red light-emitting Li+ co-doped ZnAl2O4:Eu3+ nanophosphors synthesized by a modified sol–gel route. These nanophosphors show excellent red emission due to the 5D0 → 7F j (j = 1, 2, 3, and 4) transition of Eu3+ ions under 394 nm excitation. Li+ co-doped ZnAl2O4:Eu3+ nanophosphors exhibit an almost 2-fold increase in photoluminescence (PL) intensity upon incorporation of the optimum amount of Li+ in the ZnAl2O4:Eu3+ matrix. Apart from that, Li+ co-doping leads to the improvement of CIE coordinates that is also reflected from the enhanced color purity offered by the co-doped nanophosphors. Steady-state as well as time-resolved PL spectra clearly reveal that addition of Li+ co-activator successfully reduces nonradiative transitions in the co-doped nanophosphors. Introduction of Li+ in Eu3+ doped ZnAl2O4 effectively neutralizes the charge imbalance problem and thus leads to a significant increase in the PL efficiency of the nanophosphors. The red LED fabricated by those co-doped nanophosphors exhibits strong red emission under a driving voltage of 3 V. Obtained results strongly highlight the bright prospect of Li+ co-doped ZnAl2O4:Eu3+ nanophosphors in the LED and display applications.

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Section: Introductionmentioning

confidence: 99%

ZnAl₂O₄:Eu³⁺ Nanoparticle Phosphors Co-doped with Li⁺ for Red Light-Emitting Diodes

Samanta

Dey

et al. 2021

ACS Appl. Nano Mater.

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“…The emission spectra of the same series of samples at 273-nm excitation, (B) the excitation spectra of CaMoO 4 :5Dy 3+ , xLi + (x = 0%, 2%, 5%, 7%, 10%) at 573-nm emission, (C) integrated intensity ratio (A 21 ) at 273-nm excitation results in a collapse of the crystal lattice. 44 Hence, the PL intensity decreases after 5% in our case. The changes in the intensity of emission with Li + concentration are shown in the inset of Figure 8A.…”

Section: F I G U R E 7 (A) Emission Spectrum (B) Excitation Spectra A...mentioning

confidence: 46%

“…This results in a strong mixing of charge transfer states giving rise to high optical transition and consequently high luminescence intensity. But, after a certain concentration of Li + doping, these oxygen vacancies greatly increase, which results in a collapse of the crystal lattice 44 . Hence, the PL intensity decreases after 5% in our case.…”

Section: Resultsmentioning

confidence: 63%

Insight into the spectroscopic behavior of Dy³⁺‐substituted and Li⁺ charge–compensated molybdate phosphors

et al. 2022

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Efficient utilization of phosphors in solid-state lighting and phosphor-converted light-emitting diodes demands high emission intensity, narrow size distribution, and tunable luminescence. Here in this work, un-doped and Li + co-doped CaMoO 4 :Dy 3+ nanoparticles are synthesized via modified reflux method in ethylene glycol medium at 130 • C. The host shows broad dual band emission centered in blue and green regions endowed by charge transfer and defects.Upon Dy 3+ doping, the host-to-dopant energy transfer causes the CaMoO 4 :Dy 3+ nanoparticles to exhibit characteristic emission lines from Dy 3+ . The Commission Internationale de L'Eclairage (CIE 1931) chromaticity coordinates for the prepared phosphors are estimated and found to lie in the nearly white region of color space. The light output as well as excited state lifetimes are successfully improved by lithium co-doping by virtue of reduced charge compensating defects and sensitization via oxygen-related defects. The positron annihilation studies show that all the lithium concentration co-doped for charge compensation is merely helping in the removal of cations. This work shows the role of lithium co-doping and its optimum concentration in improving the optical properties of phosphors.

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“…Although the energy transfer between charge transfer bands and Ln 3+ ions can be calculated using theoretical models, 61 this is not necessary for the present analysis because the O 2− → Eu 3+ charge transfer band is far away in energy from the 5 D 2 , 5 D 1 , and 5 D 0 levels (around 235 nm). 62…”

Section: Resultsmentioning

confidence: 99%

Resonance/off-resonance excitations: implications on the thermal evolution of Eu³⁺ photoluminescence

Hernández-Rodríguez

Neto

et al. 2023

J. Mater. Chem. C

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Enhancement of luminescence intensity and spectroscopic analysis of Eu3+-activated and Li+ charge-compensated CaTiO3 color tunable phosphors for solid-state lighting

Cited by 25 publications

References 41 publications

ZnAl₂O₄:Eu³⁺ Nanoparticle Phosphors Co-doped with Li⁺ for Red Light-Emitting Diodes

ZnAl₂O₄:Eu³⁺ Nanoparticle Phosphors Co-doped with Li⁺ for Red Light-Emitting Diodes

Insight into the spectroscopic behavior of Dy³⁺‐substituted and Li⁺ charge–compensated molybdate phosphors

Resonance/off-resonance excitations: implications on the thermal evolution of Eu³⁺ photoluminescence

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Enhancement of luminescence intensity and spectroscopic analysis of Eu3+-activated and Li+ charge-compensated CaTiO3 color tunable phosphors for solid-state lighting

Cited by 25 publications

References 41 publications

ZnAl2O4:Eu3+ Nanoparticle Phosphors Co-doped with Li+ for Red Light-Emitting Diodes

ZnAl2O4:Eu3+ Nanoparticle Phosphors Co-doped with Li+ for Red Light-Emitting Diodes

Insight into the spectroscopic behavior of Dy3+‐substituted and Li+ charge–compensated molybdate phosphors

Resonance/off-resonance excitations: implications on the thermal evolution of Eu3+ photoluminescence

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Product

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ZnAl₂O₄:Eu³⁺ Nanoparticle Phosphors Co-doped with Li⁺ for Red Light-Emitting Diodes

ZnAl₂O₄:Eu³⁺ Nanoparticle Phosphors Co-doped with Li⁺ for Red Light-Emitting Diodes

Insight into the spectroscopic behavior of Dy³⁺‐substituted and Li⁺ charge–compensated molybdate phosphors

Resonance/off-resonance excitations: implications on the thermal evolution of Eu³⁺ photoluminescence