Blue and green light exciton emission of chloro-brominated perovskite quantum dots glasses

Lin, Mengqi; Zhang, Xizhen; Guo, L. Jay; Zhang, Yuhang; Song, Ruixin; Xu, Sai; Zhu, Huichao; Cheng, Chuanhui; Cao, Yongze; Wang, Yichao; Chen, Baojiu

doi:10.1016/j.optmat.2021.111654

Cited by 10 publications

(3 citation statements)

References 49 publications

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“…borosilicate glass [18][19][20][21][22][23][24], germanate glass [25,26] and multi-component borate glass [27][28][29]. Among these glass matrixes, the multi-component borate glass matrix is suitable glass matrix because of low melt temperature, appropriate viscosity, suitable solid solubility and good uniformity for CsPbX3 QDs.…”

Section: Introductionmentioning

confidence: 99%

Cu2+ doped CsPb(Cl/Br)3 quantum dots glasses for high performance long wavelength pass filters in the blue-purple region

Song,

Yu,

Zhang

et al. 2024

Preprint

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The CsPb(Cl/Br)3 quantum dots (QDs) with high Cl content are difficult to precipitate in the glass matrix, which hiders the development of the long wavelength pass filter operating in blue-purple region. In this work, the Cu2+ doped CsPb(Cl/Br)3 QDs glasses have been fabricated in the borate glass matrix by melt quenching process. To increase the Cl content, high Cl/Br ratio is used, and a crucible cover is used during the melting process to reduce Cl volatilization. The transmittance (T%), optical density (OD), photoluminescence (PL), PL excitation (PLE) and PL decay have been evaluated. The working wavelength of filters has been extended from ~500 nm to 412 nm. Small amount Cu2+ of 0.005–0.3 mol % is used for PL quenching and meanwhile maintaining excellent properties in transmittance and OD. As Cu2+ concentration increases, the PL intensity is quenched and the PL lifetime is decreased for the CsPb(Cl/Br)3 QDs. Quenching mechanism is considered as energy dependent electron transfer (ET). The fabricated CsPb(Cl/Br)3 QD glasses can meet requirements for the long wavelength pass filters in the blue-purple region.

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Section: Introductionmentioning

confidence: 99%

Cu2+ doped CsPb(Cl/Br)3 quantum dots glasses for high performance long wavelength pass filters in the blue-purple region

Song,

Yu,

Zhang

et al. 2024

Preprint

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show abstract

“…Encapsulating QDs with an inorganic glass matrix can combine the excellent optical properties of QDs and the high chemical and thermal stability of the glass. Thus, QDs such as CdSe, − PbS, and perovskite QDs − have been embedded in glasses and have attracted a lot of attention. However, the highest reported PLQYs for CdSe and CsPbBr 3 QDs embedded in glass matrices are 48.6% and 86.9%, respectively, which are much lower than their colloidal counterparts.…”

Section: Introductionmentioning

confidence: 99%

Defective Nature of CdSe Quantum Dots Embedded in Inorganic Matrices

Zhao

et al. 2022

J. Am. Chem. Soc.

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Quantum dots (QDs) embedded in inorganic matrices have been extensively studied for their potential applications in lighting, displays, and solar cells. While a significant amount of research studies focused on their experimental fabrication, the origin of their relatively low photoluminescence quantum yield has not been investigated yet, although it severely hinders practical applications. In this study, we use time-dependent density functional theory (TDDFT) to pinpoint the nature of excited states of CdSe QDs embedded in various inorganic matrices. The formation of undercoordinated Se atoms and nonbridging oxygen atoms at the QD/glass interface is responsible for the localization of a hole wave function, leading to the formation of lowenergy excited states with weak oscillator strength. These states provide pathways for nonradiative processes and compete with radiative emission. The photoluminescence performance is predicted for CdSe QDs in different matrices and validated by experiments. The results of this study have significant implications for understanding the underlying photophysics of CdSe QDs embedded in inorganic matrices that would facilitate the fabrication of highly luminescent glasses.

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“…Encapsulating quantum dots with an inorganic glass matrix can combine the excellent optical properties of QDs and the high chemical and thermal stability of the glass. Thus, QDs such as CdSe, [11][12][13][14] PbS, 15 and perovskite QDs, [16][17][18][19][20] have been embedded in glasses and attracted a lot of attention. However, the highest reported PLQYs for CdSe and CsPbBr3 QDs embedded in glass matrices are 48.6% 21 and 86.9% 18 , respectively, much lower than their colloidal counterparts.…”

Section: Introductionmentioning

confidence: 99%

The defective nature of CdSe quantum dots embedded in inorganic matrices

Zhao

et al. 2022

Preprint

View full text Add to dashboard Cite

Quantum dots (QDs) embedded in inorganic matrices have been extensively studied for their potential applications in lighting, displays, and solar cells. While a significant amount of research focused on its experimental fabrication, the origin of their relatively low photoluminescence quantum yield has not been investigated yet, although it severely hinders practical applications. In this work, we use time-dependent density functional theory (TDDFT) to pinpoint the nature of excited states of CdSe quantum dots embedded in various inorganic matrices. The formation of undercoordinated Se atoms and non-bridging oxygen atoms at QD/glass interface is responsible for the localization of a hole wavefunction, leading to the formation of low- energy excited states with weak oscillator strength. These states provide pathways for non-radiative processes and compete with radiative emission. The photoluminescence performance is predicted for CdSe quantum dots in different matrices, and validated by experiments. The results of this work have significant implications for understanding the underlying photophysics of CdSe quantum dots embedded in inorganic matrices that would facilitate the fabrication of highly luminescent glasses.

show abstract

Blue and green light exciton emission of chloro-brominated perovskite quantum dots glasses

Cited by 10 publications

References 49 publications

Cu2+ doped CsPb(Cl/Br)3 quantum dots glasses for high performance long wavelength pass filters in the blue-purple region

Cu2+ doped CsPb(Cl/Br)3 quantum dots glasses for high performance long wavelength pass filters in the blue-purple region

Defective Nature of CdSe Quantum Dots Embedded in Inorganic Matrices

The defective nature of CdSe quantum dots embedded in inorganic matrices

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