The preparation and up-conversion properties of full spectrum CsPbX<sub>3</sub> (X = Cl, Br, I) quantum dot glasses

Zhang, Huiling; Jin, Mengfeifei; Liu, Xiaodong; Zhang, Yaqian; Yu, Yanxia; Liang, Xiaojuan; Wang, Ting

doi:10.1039/c9nr06509a

Cited by 49 publications

(23 citation statements)

References 27 publications

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“…The PL peak at ≈506 nm may come from the BE carrier recombination of the α‐Er/Yb:CsPb(Cl/Br) 3 , since the free excitons are usually unstable at room‐temperature due to small exciton binding energy in 3D perovskite. [ 30,31 ] The bandgap of the α‐Er/Yb:CsPb(Cl/Br) 3 can be estimated by the photon energy of its PL peak, 2.45 eV. At the same time, using the Cl:Br ratio (1:2) determined from EDX characterization, the bandgap of the α‐Er/Yb:CsPb(Cl/Br) 3 can be estimated to be 2.45 eV, which is consistent with the photon energy of the PL peak at 506 nm (see Table S2, Supporting Information).…”

Section: Resultssupporting

confidence: 66%

Light‐Soaking Induced Optical Tuning in Rare Earth‐Doped All‐Inorganic Perovskite

Ouyang

Jiang

et al. 2021

Adv Funct Materials

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Understanding and manipulating the photoluminescence (PL) of all‐inorganic perovskites is significant in applications toward light‐emitting diodes. Doping has proved to be a very promising approach for tuning the luminescence properties of perovskites. Herein, rare earth (Er and Yb) doped 3D all‐inorganic perovskite flakes (CsPb(Cl/Br)3) are synthesized. At room temperature, they possess a narrow emission peak at 506 nm with 10 nm linewidth and a quite broad peak at 700 nm with 170 nm linewidth, which are from band‐edge PL of α‐CsPb(Cl/Br)3 and self‐trapped excitons of δ‐CsPb(Cl/Br)3, respectively. When exposing the flakes under a light‐soaking, the samples present a color tuning capability spanning from red to green by extension of the soaking time, and the emission properties can recover by removing the light‐soaking and undergoing a certain recovery time. Time‐resolved photoluminescence indicates a photoinduced reduction of defects density in the doped perovskite flakes. Based on further density functional theory calculations, a photoinduced O2‐diffused defect‐passivation mechanism is proposed. The discovery is expected to promote the optical tuning capability of the all‐inorganic perovskites and expand their potential application in optoelectronics devices.

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Section: Resultssupporting

confidence: 66%

Light‐Soaking Induced Optical Tuning in Rare Earth‐Doped All‐Inorganic Perovskite

Ouyang

Jiang

et al. 2021

Adv Funct Materials

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“…[ 42,43 ] These CsPbX 3 NCs embedded glasses have shown great potential towards various applications such as LEDs, [ 39 ] cryogenic temperature sensors, [ 42 ] data storage, [ 44 ] and low‐threshold lasers. [ 45,46 ] In this work, CsPbX 3 NCs were embedded into glasses and femtosecond transient absorption (fs‐TA) spectroscopy was utilized to investigate the ultrafast ASPL process. The results revealed that FEs were formed with the assistance of phonons under SGE, and within a few ps, these FE thermally dissociated into free carriers, which led to the ASPL through the radiative recombination.…”

Section: Introductionmentioning

confidence: 99%

Two‐Step Anti‐Stokes Photoluminescence of CsPbX₃ Nanocrystals

Zhang

Liu

et al. 2020

Advanced Optical Materials

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Cesium lead halide (CsPbX3, X = Cl, Br, and I) perovskite nanocrystals (NCs) exhibit efficient anti‐Stokes photoluminescence (ASPL) upon sub‐gap single‐photon excitation, which has great potential for all‐solid‐state laser cooling. However, the mechanism responsible for the ASPL still remains elusive. Here, ASPL properties of CsPb(BrI)3 NCs and CsPbI3 NCs in inorganic solid matrix are investigated. Excitation wavelength‐ and power‐dependent ASPL demonstrates that it is a phonon‐assisted single‐photon process. Femtosecond transient absorption spectra show that ASPL is mediated by the Urbach tail states, where localized excitons are generated upon sub‐gap excitation. Through electron–phonon coupling, these localized excitons change into free exciton to generate the exciton bleaching, and then thermally dissociate into free carriers accompanied by band edge bleaching, leading to the efficient ASPL. Such a two‐step up‐conversion process is further confirmed by the carrier temperature extracted from the band edge bleaching band. This work deepens the understanding of ASPL in CsPbX3 NCs, and is valuable for the development of materials for solid‐state laser cooling.

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“…The perovskite QD particle size increases with the increase in heat treatment temperature, and the size of the QDs in the glass affects exciton binding energies. 37,38 As the exciton binding energy exceeded 100 meV, the electron−hole pair became tightly bound such that it would be unlikely to diffuse with lattice vibration. 13 We assumed the excitons to be tightly bound Frenkel excitons rather than Wannier Mott excitons coupled with lattice vibrations 13,19 Based on the above results, the unique PL properties of 0-D Cs 4 PbBr 6 QDs in glass were unaffected by the coexistence of 3-D CsPbBr 3 ; therefore, we examined other plausible explanations for the PL behavior of bulk Cs 4 PbBr 6 QD glass.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Ultrastable Zero-Dimensional Cs₄PbBr₆ Perovskite Quantum Dot Glass

Liu

et al. 2020

ACS Sustainable Chem. Eng.

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The instability of all-inorganic perovskites and poor understanding of the photoluminescence mechanisms have hindered their practical applications. While a large body of work on 3-D perovskite phases is available in the literature, the promising zero-dimensional (0-D) phase perovskite materials are still poorly understood. Herein, we report a new synthesis method for the production of 0-D Cs4PbBr6 perovskite quantum dots (QDs) in glass using a combination of Cs2CO3 concentration and heat-treatment temperature optimization. The differences in structure, morphology, and photoluminescence (PL) between the 0-D Cs4PbBr6 QDs and the 3-D CsPbBr3 QDs in glass were studied in detail. Cs4PbBr6 QD glass with high transmittance displayed a blue-shift PL emission centered at 503 nm, a narrow full width at half-maximum (fwhm, ∼20 nm), a high photoluminescence quantum yield (PLQY, ∼22%), and excellent long-term stability, thereby, advancing the study of these materials. It was demonstrated that Cs4PbBr6 displayed unique luminescent properties in correlation with the intrinsic defect states in the mid-band gap.

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The preparation and up-conversion properties of full spectrum CsPbX₃ (X = Cl, Br, I) quantum dot glasses

Abstract: Multi-color up-conversion emission of CsPbX3 (X = Cl, Br, I) quantum dot glasses under two-photon excitation.

Cited by 49 publications

References 27 publications

Light‐Soaking Induced Optical Tuning in Rare Earth‐Doped All‐Inorganic Perovskite

Light‐Soaking Induced Optical Tuning in Rare Earth‐Doped All‐Inorganic Perovskite

Two‐Step Anti‐Stokes Photoluminescence of CsPbX₃ Nanocrystals

Ultrastable Zero-Dimensional Cs₄PbBr₆ Perovskite Quantum Dot Glass

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The preparation and up-conversion properties of full spectrum CsPbX3 (X = Cl, Br, I) quantum dot glasses

Abstract: Multi-color up-conversion emission of CsPbX3 (X = Cl, Br, I) quantum dot glasses under two-photon excitation.

Cited by 49 publications

References 27 publications

Light‐Soaking Induced Optical Tuning in Rare Earth‐Doped All‐Inorganic Perovskite

Light‐Soaking Induced Optical Tuning in Rare Earth‐Doped All‐Inorganic Perovskite

Two‐Step Anti‐Stokes Photoluminescence of CsPbX3 Nanocrystals

Ultrastable Zero-Dimensional Cs4PbBr6 Perovskite Quantum Dot Glass

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Product

Resources

About

The preparation and up-conversion properties of full spectrum CsPbX₃ (X = Cl, Br, I) quantum dot glasses

Two‐Step Anti‐Stokes Photoluminescence of CsPbX₃ Nanocrystals

Ultrastable Zero-Dimensional Cs₄PbBr₆ Perovskite Quantum Dot Glass