Influence of transition metal ions: Broad band upconversion emission in thermally stable phosphors

Prasad, Manisha; Kumar, Vineet

doi:10.1016/j.jallcom.2020.155289

Cited by 32 publications

(23 citation statements)

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“…The intense peak at 974 nm has been observed due to the overlapping transitions from the Yb 3+ and Er 3+ ions. Further, the DRS spectra can be used to nd the bandgap of the developed phosphors using the following Kubelka-Munk function F(R N ) and Tauc relationship by 36 [F(R N )hn] = C(hn − E g ) n…”

Section: Optical Studymentioning

confidence: 99%

Strategies for designing low thermal quenching upconverting temperature sensors

2023

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Section: Optical Studymentioning

confidence: 99%

Strategies for designing low thermal quenching upconverting temperature sensors

2023

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“…Based on Blasse's theory, [45][46][47][48][49] the critical distance (R c ) of xEu 3+ phosphor, the values of N, X c and V were 8, 0.03, and 377.841 Å 3 respectively. From the above equation, the critical energy transfer distance was estimated to be about 14.079 Å, which was greater than 5 Å.…”

Section: Photoluminescence Spectral Analysismentioning

confidence: 99%

Synthesis and characterization of a Eu³⁺‐activated Ba_2–xV₂O₇:xEu³⁺ phosphor using a hydrothermal method: a potential material for near‐UV‐WLED applications

Bharathi¹,

Jeyakumaran²,

Ramaswamy³

et al. 2021

Luminescence

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Eu 3+ -activated Ba 2 V 2 O 7 (Ba 2-x V 2 O 7 :xEu 3+ ) phosphor materials were synthesized using a hydrothermal method and different concentrations of europium (x = 0.01, 0.02, 0.03, 0.04, and 0.05%). Phase purity, structural, morphological, optical, and luminescence characteristics of the as-synthesized phosphors were studied using powder X-ray diffraction (XRD), high resolution scanning electron microscopy, UV-visible spectroscopy, and fluorescence spectrometry. The recorded XRD patterns of the as-synthesized phosphors were indexed and predicted to be a triclinic structure. A cube-like morphology was obtained for the as-prepared samples. Broad absorption in the UV region from 200 nm to 380 nm was observed and the good transparency in the visible region at 400-800 nm originated from the [VO 4 ] 3− group charge transfer (CT) transition. The broad emission peak centred at 499 nm was due to the CT band of the [VO 4 ] 3− group. Also, a sharp peak observed at 613 nm was due to the electric dipole transition of 5 D 0 ! 7 F 2 of Eu 3+ ions that occupied the lattice sites without inversion symmetry for all concentrations. The colour qualities of the as-prepared samples were calculated using Commission International de l'Eclairage coordinates. The colour-rending index (CRI) value was 86 for the Ba 1.97 V 2 O 7 :0.03Eu 3+ phosphor. Furthermore, a WLED with a high CRI value of 95 was achieved by coupling the 3 W 356 nm near-UV light-emitting diode (LED) chip with the Ba 2-x V 2 O 7 :xEu 3+ phosphor. These results suggested that the as-prepared phosphor materials are potential candidates for fabrication of near-UV chip excited WLEDs.

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“…The codoping of non-lanthanides usually acts as a charge compensator and sensitizer, which increases the intensity and thermal stability of the phosphors. 9,10 It has been proposed that the codoping of transition metals successfully improves the up-conversion performance. 11,12 Thus, the transition metal molybdate may play a vital role to enhance the emission arising from rare earth ions.…”

Section: Introductionmentioning

confidence: 99%

Upconverting temperature sensors with high activation energy and low pump threshold

Prasad

Kumar

2023

New J. Chem.

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Influence of transition metal ions: Broad band upconversion emission in thermally stable phosphors

Cited by 32 publications

References 50 publications

Strategies for designing low thermal quenching upconverting temperature sensors

Strategies for designing low thermal quenching upconverting temperature sensors

Synthesis and characterization of a Eu³⁺‐activated Ba_2–xV₂O₇:xEu³⁺ phosphor using a hydrothermal method: a potential material for near‐UV‐WLED applications

Upconverting temperature sensors with high activation energy and low pump threshold

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Influence of transition metal ions: Broad band upconversion emission in thermally stable phosphors

Cited by 32 publications

References 50 publications

Strategies for designing low thermal quenching upconverting temperature sensors

Strategies for designing low thermal quenching upconverting temperature sensors

Synthesis and characterization of a Eu3+‐activated Ba2–xV2O7:xEu3+ phosphor using a hydrothermal method: a potential material for near‐UV‐WLED applications

Upconverting temperature sensors with high activation energy and low pump threshold

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Product

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Synthesis and characterization of a Eu³⁺‐activated Ba_2–xV₂O₇:xEu³⁺ phosphor using a hydrothermal method: a potential material for near‐UV‐WLED applications