Bi3+ and Sm3+ co-doped Cs2AgInCl6 perovskite microcrystals with co-enhancement of fluorescence emission

Rao, Zhihui; Li, Zhilin; Zhao, Xiujian; Gong, Xiao

doi:10.1039/d2nj02856e

Cited by 12 publications

(4 citation statements)

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“…However, when doped with a small amount of Bi (∼1%), DP:S1.9 exhibited both the broad STE emission and all characteristic sharp peaks of Sm 3+ located around ∼565, 602, 645, and 710 nm corresponding to 4 G 5/2 to 6 H J (J = 5/2, 7/2, 9/2, and 11/2) transitions. 56 A new peak at 368 nm emerges in the excitation spectra for the emission wavelength of 604 nm as we can obtain the intrinsic emission of Sm 3+ at 280 nm excitation irrespective of Bi doping; it suggests that the direct transfer from the free exciton to Sm 3+ cannot be dismissed entirely. 57 However, the strength of excitation at 368 nm is larger than that at 280 nm in the PLE spectrum, signifying that the Sm 3+ excitation via the energy-transfer channel is more efficient than direct excitation.…”

Section: ■ Results and Discussionmentioning

confidence: 77%

“…In the case of the sample without Bi, the PLE spectrum showed only one broad peak around ∼290 nm when the emission was monitored at the 604 nm. However, when doped with a small amount of Bi (∼1%), DP:S1.9 exhibited both the broad STE emission and all characteristic sharp peaks of Sm 3+ located around ∼565, 602, 645, and 710 nm corresponding to 4 G 5/2 to 6 H J ( J = 5/2, 7/2, 9/2, and 11/2) transitions . A new peak at 368 nm emerges in the excitation spectra for the emission wavelength of 604 nm as we can obtain the intrinsic emission of Sm 3+ at 280 nm excitation irrespective of Bi doping; it suggests that the direct transfer from the free exciton to Sm 3+ cannot be dismissed entirely .…”

Section: Results and Discussionmentioning

confidence: 83%

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Self-Trapped Excitons Mediated Energy Transfer to Sm³⁺ in Cs₂AgIn_(1–x)Sm_xCl₆:Bi Double Perovskite Nanocrystals

et al. 2022

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Lanthanide ions (Ln3+) are well-known dopants for controlling the optoelectronic properties of double perovskites (DPs). However, the excitation energy of Ln3+-doped Cs2AgInCl6 being too high (∼250–290 nm) limits its direct excitation by commercial UV light-emitting diodes (≥365 nm). To overcome this challenge, we employed Bi3+ as a sensitizer to induce the emission of Sm3+ at much lower excitation energy in Sm3+–Bi3+ codoped Cs2AgInCl6 DP nanocrystals (NCs). Spectral analysis shows that a trace amount of Bi3+ (∼1%) doping provides dual emission of self-trapped excitons (STEs) and characteristic emissions of Sm3+ assigned to 4G5/2 to 6H J (J = 5/2, 7/2, 9/2, and 11/2) transitions with 368 nm excitation energy. Transient absorption spectroscopic results revealed the existence of nonradiative energy transfer from STE states. Subsequently, we propose a mechanism to explain the formation of energy-transfer channels from STEs to excited states of Sm3+. Our study demonstrates that Bi3+ can efficiently sensitize Sm3+ to modify the optical properties of lead-free DP NCs to expand their luminescence application.

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Section: ■ Results and Discussionmentioning

confidence: 77%

Section: Results and Discussionmentioning

confidence: 83%

Self-Trapped Excitons Mediated Energy Transfer to Sm³⁺ in Cs₂AgIn_(1–x)Sm_xCl₆:Bi Double Perovskite Nanocrystals

et al. 2022

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“…This doping‐induced modification leads to shifts in the band edges, impacting the optoelectronic behavior of the semiconductor. Consequently, variations in the band gaps of Li (1 ‐x ) Sm ( x /3) NbO 3 are observed for different compositions 68 …”

Section: Resultsmentioning

confidence: 99%

“…Consequently, variations in the band gaps of Li (1-x) Sm (x/3) NbO 3 are observed for different compositions. 68…”

Section: Uv-vis Spectroscopy Analysismentioning

confidence: 99%

Electrical and optical properties of environmental friendly Li_(1‐x)Sm_x/₃NbO₃ ceramics for high‐temperature energy storage applications

Satyarthi,

Singh,

Verma

et al. 2024

Energy Storage

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This research article delves into the synthesis and characterization of Li(1‐x)Sm(x/3)NbO3 ceramic, employing a high‐energy ball milling process. The investigation explores the incorporation of Sm3+ at the Li+1 site across a range of compositions (x = 0, 0.01, 0.02, 0.03, 0.04, 0.05). Structural analysis, using x‐ray diffraction (XRD) and Rietveld structural refinement, establishes that within the investigated composition range, no significant changes in the crystal structure are evident. The x‐ray photoelectron spectroscopy revealed the presence of oxygen vacancies as well as the stable oxidation state of different elements like O2−, Nb5+, Sm3+, and Li1+. At sintering temperature 1050°C, the average grain sizes vary approximately from 1.5 to 3.8 μm for different compositions with regular grain morphology. The UV‐Vis analysis reveals a noteworthy reduction in the band gap to 3.09 eV for the x = 0.01 composition. Photoluminescence studies exhibit distinct green, orange, and red bands, with the highest intensity observed for x = 0.01, showcasing promising optical properties. The dielectric permittivity of Sm‐substituted compositions surpasses the response of pure LiNbO3, demonstrating an increasing trend with temperature in the frequency range 100 Hz‐1 MHz intriguingly, no Curie temperature is observed up to 500°C for any composition. The polarization vs electric field hysteresis loop response highlights better polarization characteristics at the room temperature and maximum polarization is 0.66 μC/cm2 for the composition x = 0.05. The energy storage response of the developed compositions is investigated, which reveals a maximum efficiency of 46.64% for x = 0.04 in Li(1‐x)Sm(x/3)NbO3. The tunable optical properties, enhanced dielectric response, and notable energy efficiency of these high TC ceramics suggest their utility across diverse applications. These findings not only contribute to the understanding of functional ceramic materials but also pave the way for their optimized utilization in advanced technological applications, particularly in energy storage devices under nonambient conditions at high temperatures.

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Photoluminescence in rare-earth based halide double perovskite Cs2NaRECl6 (RE = Ce, Eu, Y, Lu) microcrystals

Zhang,

Li,

Cheng

et al. 2024

Ceramics International

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Bi³⁺ and Sm³⁺ co-doped Cs₂AgInCl₆ perovskite microcrystals with co-enhancement of fluorescence emission

Abstract: Cs2AgInCl6 lead-free double perovskites is environmentally benign with easily modulated fluorescence. However, its wide band gap (∼3.3 eV) and forbidden optical transitions limit the visible application. Herein, we prepared Cs2AgInCl6...

Cited by 12 publications

References 47 publications

Self-Trapped Excitons Mediated Energy Transfer to Sm³⁺ in Cs₂AgIn_(1–x)Sm_xCl₆:Bi Double Perovskite Nanocrystals

Self-Trapped Excitons Mediated Energy Transfer to Sm³⁺ in Cs₂AgIn_(1–x)Sm_xCl₆:Bi Double Perovskite Nanocrystals

Electrical and optical properties of environmental friendly Li_(1‐x)Sm_x/₃NbO₃ ceramics for high‐temperature energy storage applications

Photoluminescence in rare-earth based halide double perovskite Cs2NaRECl6 (RE = Ce, Eu, Y, Lu) microcrystals

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Bi3+ and Sm3+ co-doped Cs2AgInCl6 perovskite microcrystals with co-enhancement of fluorescence emission

Abstract: Cs2AgInCl6 lead-free double perovskites is environmentally benign with easily modulated fluorescence. However, its wide band gap (∼3.3 eV) and forbidden optical transitions limit the visible application. Herein, we prepared Cs2AgInCl6...

Cited by 12 publications

References 47 publications

Self-Trapped Excitons Mediated Energy Transfer to Sm3+ in Cs2AgIn(1–x)SmxCl6:Bi Double Perovskite Nanocrystals

Self-Trapped Excitons Mediated Energy Transfer to Sm3+ in Cs2AgIn(1–x)SmxCl6:Bi Double Perovskite Nanocrystals

Electrical and optical properties of environmental friendly Li(1‐x)Smx/3NbO3 ceramics for high‐temperature energy storage applications

Photoluminescence in rare-earth based halide double perovskite Cs2NaRECl6 (RE = Ce, Eu, Y, Lu) microcrystals

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Bi³⁺ and Sm³⁺ co-doped Cs₂AgInCl₆ perovskite microcrystals with co-enhancement of fluorescence emission

Self-Trapped Excitons Mediated Energy Transfer to Sm³⁺ in Cs₂AgIn_(1–x)Sm_xCl₆:Bi Double Perovskite Nanocrystals

Self-Trapped Excitons Mediated Energy Transfer to Sm³⁺ in Cs₂AgIn_(1–x)Sm_xCl₆:Bi Double Perovskite Nanocrystals

Electrical and optical properties of environmental friendly Li_(1‐x)Sm_x/₃NbO₃ ceramics for high‐temperature energy storage applications