Photoluminescence investigation in tungstate based materials

Prasad, Manisha; Mondal, Manisha; Mukhopadhyay, Lakshmi; Pattnaik, Sasank; Kumar, Vineet

doi:10.1016/j.matpr.2020.06.132

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…The crystallite size of pristine and DDAB-functionalized CsSnBr 3 HPs was calculated using the Debye–Scherrer formula: , D = 0.9 λ β ⁡ cos θ where D is the average crystallite size (nm), λ is the X-ray wavelength (Cu Kα = 0.15406 nm), β is full-width at half maxima (fwhm) (in radian after the correction for instrumental broadening), and θ is Bragg’s angle. The crystallite sizes of pristine and DDAB-functionalized CsSnBr 3 HPs were found to be ∼64 and ∼340 nm, respectively (Figure S1).…”

Section: Resultsmentioning

confidence: 99%

“…In this crystal structure, Cs + (shown by yellow spheres) is bonded to eight Br ¯(shown by green spheres), and Sn 2+ (shown by orange spheres) is bonded with six Brions to form corner-sharing SnBr 6 octahedra. 42 The crystallite size of pristine and DDAB-functionalized CsSnBr 3 HPs was calculated using the Debye−Scherrer formula: 43,44…”

Section: Structural and Morphological Studiesmentioning

confidence: 99%

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Improving the Stability of Lead-Free CsSnBr₃ Halide Perovskite by DDAB-Assisted Postpassivation Surface Engineering

Yadav,

Dubey,

Singh

et al. 2024

ACS Appl. Opt. Mater.

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Lead-based halide perovskites (HPs) have become a center of attention in the field of optoelectronics; however, the toxic nature of lead is a bottleneck in their long-term commercial exploration. The Sn-based HPs are being considered as potential substitutes; however, their poor stability under ambient conditions is a major challenge. To address this, we have attempted postpassivation of CsSnBr 3 with didodecyldimethylammonium (DDAB), a biexchange ligand. This ligand replaces the weak surface capping of OAm with DDA + and also fills the halide (Br) vacancies on the HP surface, thereby increasing the stability of the lead-free CsSnBr 3 HPs. In addition to improved stability, the DDAB-functionalized CsSnBr 3 HPs show ∼5.5 times enhancement in the PL intensity. The DDAB-functionalized CsSnBr 3 HPs with shorter chain lengths of DDAB (which might result in improved carrier current), prolonged stability, and improved PL behavior could be a better choice for optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

Section: Structural and Morphological Studiesmentioning

confidence: 99%

Improving the Stability of Lead-Free CsSnBr₃ Halide Perovskite by DDAB-Assisted Postpassivation Surface Engineering

Yadav,

Dubey,

Singh

et al. 2024

ACS Appl. Opt. Mater.

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“…If R c is more than 5, it means that rare earth interactions are not the result of exchange interactions. 34,46 Hence, the multipolar interaction precedes the mechanism, which may be established by the relationship given by Dexter and Van Uitert, 60 where ‘ I ’ stands for the emission intensity corresponding to each concentration and ‘ C ’ stands for the dopant ion concentration. ‘ K ’ and ‘ β ’ are constants, while ‘ Q ’ denotes the nature of the interaction between the quenching center and luminescence center.…”

Section: Resultsmentioning

confidence: 99%

Photon avalanche assisted upconversionviacustomizing the green emission

Prasad

Kumar

2023

RSC Adv.

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“…In the Er 3+ : MgWO 4 phosphors the concentration quenching phenomenon and the dipole-dipole interaction between Er 3+ ions have been reported [19]. UC emission study in the Tm 3+ /Yb 3+ : MgWO 4 phosphors has been performed [20].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous effects of synthesis temperature and dopants on MgWO₄ UC phosphors

Prasad

Kumar

2022

Methods Appl. Fluoresc.

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A sequence of coactivated divalent-metal tungstate Er3+/Yb3+/Mn4+: MgWO4 phosphors have been successfully developed to study the effect of synthesis temperature on the crystal structure, surface morphology, fluorescence, temperature sensing and the dynamics involved in the processes. Upconversion (UC) intensity of the Er3+/Yb3+: MgWO4 phosphors increased by ~ 109 and ~ 778 times on increasing the synthesis temperature from 800 ºC to 1000 ºC and 1200 ºC. UC intensity of the Er3+/Yb3+/Mn4+: MgWO4 phosphors has been significantly improved up to ~ 90 times via charge compensation. The incorporation of Mn4+ in the Er3+/Yb3+ codoped crystal system shifted the UC spectra from sharp green peaks to broadband emission along with amended sensing abilities. The ratiometric techniques of thermally coupled stark sublevels of the Er3+ have been used to achieve a wide temperature range (300 - 623K). The prepared nanophosphors show maximum absolute & relative sensitivities ~ 25.86×10-3 K-1 @453K and ~ 10.39×10-3 K-1 @303 K respectively with an accuracy of ± 0.42K@303K.

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Photoluminescence investigation in tungstate based materials

Cited by 8 publications

References 22 publications

Improving the Stability of Lead-Free CsSnBr₃ Halide Perovskite by DDAB-Assisted Postpassivation Surface Engineering

Improving the Stability of Lead-Free CsSnBr₃ Halide Perovskite by DDAB-Assisted Postpassivation Surface Engineering

Photon avalanche assisted upconversionviacustomizing the green emission

Simultaneous effects of synthesis temperature and dopants on MgWO₄ UC phosphors

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Photoluminescence investigation in tungstate based materials

Cited by 8 publications

References 22 publications

Improving the Stability of Lead-Free CsSnBr3 Halide Perovskite by DDAB-Assisted Postpassivation Surface Engineering

Improving the Stability of Lead-Free CsSnBr3 Halide Perovskite by DDAB-Assisted Postpassivation Surface Engineering

Photon avalanche assisted upconversionviacustomizing the green emission

Simultaneous effects of synthesis temperature and dopants on MgWO4 UC phosphors

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Product

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Improving the Stability of Lead-Free CsSnBr₃ Halide Perovskite by DDAB-Assisted Postpassivation Surface Engineering

Improving the Stability of Lead-Free CsSnBr₃ Halide Perovskite by DDAB-Assisted Postpassivation Surface Engineering

Simultaneous effects of synthesis temperature and dopants on MgWO₄ UC phosphors