Boosting triplet self-trapped exciton emission in Te(IV)-doped Cs2SnCl6 perovskite variants

Zeng, Ruosheng; Bai, Kun; Wei, Qilin; Chang, Tong; Yan, Jun; Bao, Ke; Huang, Jialuo; Wang, Liushun; Zhou, Weichang; Cao, Sheng; Zhao, Jianlong; Zou, B. S.

doi:10.1007/s12274-020-3214-x

Cited by 143 publications

(160 citation statements)

References 52 publications

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“…[ 42 ] Besides, the calculated exciton binding energy ( E b = 152.3 meV) by fitting temperature‐dependent PL intensities is much higher than the thermal energy at room temperature (Figure S16c, Supporting Information), which demonstrates the stability of formed STEs with highly localized behavior. [ 47 ]…”

Section: Resultsmentioning

confidence: 99%

Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Song

et al. 2021

Adv Funct Materials

218

212

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Luminescent metal halide materials with flexible crystallography/electronic structures and tunable emission have demonstrated broad application prospects in the visible light region. However, designing near‐infrared (NIR) light‐emitting metal halides remains a challenge. Here, an enlightening prototype is proposed to explore the high‐efficiency broadband NIR emission in metal halide systems by incorporating Sb3+ into the Cs2ZnCl4 matrix. Combined experimental analysis and density functional theory calculations reveal a modified self‐trapped excitons model to elaborate the NIR emission. The high photoluminescence quantum yield of 69.9% peaking at 745 nm and large full width at half maximum of 175 nm, along with excellent air/thermal stability, show the unique advantages of lead‐free metal halide Cs2ZnCl4:Sb3+ as the NIR light source. The substitution of Cl− by Br− further enables the red‐shift of emission peak from 745 to 823 nm. The NIR light‐emitting diode device based on Cs2ZnCl4:Sb3+ demonstrates potential as a non‐visible light source in night vision. This study puts forward an effective strategy to design the novel eco‐friendly and high‐efficiency NIR emissive materials and provides guidance for expanding the application scope of luminescent metal halides.

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Section: Resultsmentioning

confidence: 99%

Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Song

et al. 2021

Adv Funct Materials

218

212

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“…The STEs in Cs 2 TeCl 6 originate from the strong electron-phonon coupling in the distorted excited structure. [23,24] The triplet STE states tend to be the lowest-energy excited state for 5s 2 metals, electrons are pumped from 1 S 0 to 3 P 1 and tend to undergo triplet STEs. [25] It is worth noting that the Cs 2 TeCl 6 has only 4.2% PLQY at room temperature, fortunately, doping technology as an effective technology at B site was taken to overcome the luminescence quenching of Cs 2 TeCl 6 .…”

Section: Resultsmentioning

confidence: 99%

Efficient, Stable, and Tunable Cold/Warm White Light from Lead‐Free Halide Double Perovskites Cs₂Zr_1‐_xTe_xCl₆

Liu

Juan

et al. 2021

Advanced Optical Materials

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Single‐component materials with efficient, stable, and tunable cold/warm white‐light emission are ideal candidates for lighting applications, which can overcome the problems of different deterioration rates and reabsorption effect in conventional mixed‐phosphors strategy. Efficient white phosphors based on double halide perovskite have been reported via manipulating the parity transitions recently. However, the emission wavelength is nonadjustable. Herein, a lead‐free double perovskite Cs2Zr1−xTexCl6 that exhibits efficient and stable white‐light emission is reported. The introduction of Te4+ results in bright self‐trapped exciton (STE) emission, which endows Cs2ZrCl6 matrix with multiple luminescent centers. Efficient white luminescence with tunable color temperature and high photoluminescence quantum yield (PLQY) of 61.5% (under 254 nm, CCT = 4039 K) and 96.1% (under 365 nm, CCT = 3313 K) is achieved. Efficient energy transfer between multiple luminescent centers and appropriate doping concentrations are the key points to achieve such highly efficient and tunable white emission. The as‐synthesized Cs2Zr1−xTexCl6 composites exhibit a robust stability against heat, ultraviolet light, and environmental oxygen/moisture, which show little spectra variation with less than ≈20% efficiency loss after 980 h testing even under high temperature and UV light. These results indicate Cs2Zr1−xTexCl6 are promising single‐component white‐light‐emitting phosphors for next‐generation lighting and display technologies.

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“…The emission FWHM and intensity versus temperature and a pseudocolor mapping of Sb 3+ ‐doped (Cs 0.67 Rb 0.33 ) 2 InCl 5 ∙H 2 O and (Cs 0.29 Rb 0.71 ) 3 InCl 6 are plotted in Figure S15 (Supporting Information). After fitting these data with the following formulas:

FWHM = 2.36 \sqrt{S} ℏ ω_{phonon} \sqrt{\cot h (ℏ ω_{phonon} normal/ 2 k_{B} T)}

I (t) = I_{normalo} / (1 + A e^{- E_{a} / T K_{B}})

Γ (T) = {normalΓ}_{0} + {normalΓ}_{op} / (e^{ℏ ω_{op} / K_{B} T} - 1)

, [ 34 ] it was possible to obtain the values of S , E a , Γ op which were 26.36, 136.40 meV, and 358.18 meV for Sb 3+ ‐doped (Cs 0.67 Rb 0.33 ) 2 InCl 5 ∙H 2 O and 18.05, 59.50 meV, and 308.09 meV for (Cs 0.29 Rb 0.71 ) 3 InCl 6 , respectively. These results are consistent with the recent reports.…”

Section: Resultsmentioning

confidence: 99%

Controlled Structural Transformation in Sb‐Doped Indium Halides A₃InCl₆ and A₂InCl₅∙H₂O Yields Reversible Green‐to‐Yellow Emission Switch

Huang

Chang

Zeng

et al. 2021

Advanced Optical Materials

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Lead halide perovskites have demonstrated promising emission tunability achieved by composition engineering, which makes them viable in several potential applications. Determining how to effectively control the crystalline structural transformation and composition in lead‐free halide perovskites is of great importance. Herein, a controllable synthetic method is reported to obtain the 0D metal halide perovskite derivatives (Cs1−xRbx)2InCl5∙H2O and (Cs1−xRbx)3InCl6, through synergistic regulation of the Cs/Rb feed ratios and the reaction solvent. When hydrochloric acid (HCl) is used as the reaction solvent, (Cs1−xRbx)2InCl5∙H2O is obtained at a high Cs/Rb feed ratio greater than 2:1, while (Cs1−xRbx)3InCl6 is obtained at a low Cs/Rb feed ratio of less than 2:5. However, when anhydrous methanol (MeOH) is used as the reaction solvent, only the (Cs1−xRbx)3InCl6 structure is obtained at all Cs/Rb feed ratios. In addition, a reversible crystalline structural transformation is demonstrated between (Cs0.67Rb0.33)2InCl5∙H2O and (Cs0.67Rb0.33)3InCl6 by immersing the as‐prepared products into MeOH and HCl sequentially, which generates a novel green/yellow reversible emission switch. The Sb3+ ion self‐trapped exciton emission and stability of the synthesized (Cs1−xRbx)2InCl5∙H2O and (Cs1−xRbx)3InCl6 are systematically investigated. The results are helpful for promoting the diverse photonics and optoelectronics applications of these environmentally stable perovskite derivatives.

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Boosting triplet self-trapped exciton emission in Te(IV)-doped Cs2SnCl6 perovskite variants

Cited by 143 publications

References 52 publications

Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Efficient, Stable, and Tunable Cold/Warm White Light from Lead‐Free Halide Double Perovskites Cs₂Zr_1‐_xTe_xCl₆

Controlled Structural Transformation in Sb‐Doped Indium Halides A₃InCl₆ and A₂InCl₅∙H₂O Yields Reversible Green‐to‐Yellow Emission Switch

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Boosting triplet self-trapped exciton emission in Te(IV)-doped Cs2SnCl6 perovskite variants

Cited by 143 publications

References 52 publications

Sb3+‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Sb3+‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Efficient, Stable, and Tunable Cold/Warm White Light from Lead‐Free Halide Double Perovskites Cs2Zr1‐xTexCl6

Controlled Structural Transformation in Sb‐Doped Indium Halides A3InCl6 and A2InCl5∙H2O Yields Reversible Green‐to‐Yellow Emission Switch

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Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Sb³⁺‐Doping in Cesium Zinc Halides Single Crystals Enabling High‐Efficiency Near‐Infrared Emission

Efficient, Stable, and Tunable Cold/Warm White Light from Lead‐Free Halide Double Perovskites Cs₂Zr_1‐_xTe_xCl₆

Controlled Structural Transformation in Sb‐Doped Indium Halides A₃InCl₆ and A₂InCl₅∙H₂O Yields Reversible Green‐to‐Yellow Emission Switch