NIR Luminescence from Deep-Level Traps in CsPbBr3 Microcrystals

Jonathan Vandenwijngaerden; Bapi Pradhan; Bob Van Hout; Eduard Fron; Yasuyuki Araki; Xianjun Zhang; Yutaka Shibata; Dario Santantonio; Roger Bresoli-Obach; Santi Nonell; Haifeng Yuan; Jialiang Xu; Mark Van der Auweraer; Maarten Roeffaers; Johan Hofkens; Hiroshi Fukumura; Elke Debroye

doi:10.1021/acs.jpclett.5c00545

NIR Luminescence from Deep-Level Traps in CsPbBr₃ Microcrystals

Jonathan Vandenwijngaerden, Bapi Pradhan, Bob Van Hout, Eduard Fron, Yasuyuki Araki, Xianjun Zhang, Yutaka Shibata, Dario Santantonio, Roger Bresoli-Obach, Santi Nonell, Haifeng Yuan, Jialiang Xu, Mark Van der Auweraer, Maarten Roeffaers, Johan Hofkens^*, Hiroshi Fukumura, Elke Debroye^*

^*Autor corresponent d’aquest treball

Producció científica: Article en revista indexada › Article › Avaluat per experts

Resum

In this study, we report the first observation of a near-infrared (NIR) emission band from all-inorganic CsPbBr₃ and CsPb(Br/Cl)₃ perovskite microcrystals. By means of temperature- and power-dependent NIR and visible luminescence spectroscopy, we demonstrate that a fraction of the excited states in these materials relax through radiative transitions involving traps located deep within the band gap, leading to broadband NIR emission. The quantum yield of this deep trap emission is quantitatively determined for the first time and amounts to approximately 0.3% at room temperature. Furthermore, by examining the picosecond-to-nanosecond dynamics of the excited states, using time-resolved luminescence spectroscopy, we observe that the population of NIR initial states occurs on a 660 ps time scale, consistent with the capture of free carriers by deep trap sites. Hence, this work deepens our fundamental understanding of previously unexplored recombination channels in metal halide perovskite microcrystals.

Idioma original	Anglès
Pàgines (de-a)	3491-3500
Nombre de pàgines	10
Revista	Journal of Physical Chemistry Letters
Volum	16
Número	14
DOIs	https://doi.org/10.1021/acs.jpclett.5c00545
Estat de la publicació	Publicada - 10 d’abr. 2025

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10.1021/acs.jpclett.5c00545Llicència: CC BY

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Com citar-ho

Vandenwijngaerden, J., Pradhan, B., Van Hout, B., Fron, E., Araki, Y., Zhang, X., Shibata, Y., Santantonio, D., Bresoli-Obach, R., Nonell, S., Yuan, H., Xu, J., Van der Auweraer, M., Roeffaers, M., Hofkens, J., Fukumura, H., & Debroye, E. (2025). NIR Luminescence from Deep-Level Traps in CsPbBr₃ Microcrystals. Journal of Physical Chemistry Letters, 16(14), 3491-3500. https://doi.org/10.1021/acs.jpclett.5c00545

@article{72e68d08f1a2479090272bbefb823c02,

title = "NIR Luminescence from Deep-Level Traps in CsPbBr3 Microcrystals",

abstract = "In this study, we report the first observation of a near-infrared (NIR) emission band from all-inorganic CsPbBr3 and CsPb(Br/Cl)3 perovskite microcrystals. By means of temperature- and power-dependent NIR and visible luminescence spectroscopy, we demonstrate that a fraction of the excited states in these materials relax through radiative transitions involving traps located deep within the band gap, leading to broadband NIR emission. The quantum yield of this deep trap emission is quantitatively determined for the first time and amounts to approximately 0.3\% at room temperature. Furthermore, by examining the picosecond-to-nanosecond dynamics of the excited states, using time-resolved luminescence spectroscopy, we observe that the population of NIR initial states occurs on a 660 ps time scale, consistent with the capture of free carriers by deep trap sites. Hence, this work deepens our fundamental understanding of previously unexplored recombination channels in metal halide perovskite microcrystals.",

keywords = "Perovskite, Spectroscopy, Stability, Energy, Quantum dots, Photoluminescence, Hybrid, Photosystem-ii, Kinetics, Lead bromide",

author = "Jonathan Vandenwijngaerden and Bapi Pradhan and \{Van Hout\}, Bob and Eduard Fron and Yasuyuki Araki and Xianjun Zhang and Yutaka Shibata and Dario Santantonio and Roger Bresoli-Obach and Santi Nonell and Haifeng Yuan and Jialiang Xu and \{Van der Auweraer\}, Mark and Maarten Roeffaers and Johan Hofkens and Hiroshi Fukumura and Elke Debroye",

note = "Publisher Copyright: {\textcopyright} 2025 The Authors. Published by American Chemical Society.",

year = "2025",

month = apr,

day = "10",

doi = "10.1021/acs.jpclett.5c00545",

language = "English",

volume = "16",

pages = "3491--3500",

journal = "Journal of Physical Chemistry Letters",

issn = "1948-7185",

publisher = "American Chemical Society",

number = "14",

}

Vandenwijngaerden, J, Pradhan, B, Van Hout, B, Fron, E, Araki, Y, Zhang, X, Shibata, Y, Santantonio, D, Bresoli-Obach, R , Nonell, S, Yuan, H, Xu, J, Van der Auweraer, M, Roeffaers, M, Hofkens, J, Fukumura, H & Debroye, E 2025, 'NIR Luminescence from Deep-Level Traps in CsPbBr₃ Microcrystals', Journal of Physical Chemistry Letters, vol. 16, núm. 14, pàg. 3491-3500. https://doi.org/10.1021/acs.jpclett.5c00545

TY - JOUR

T1 - NIR Luminescence from Deep-Level Traps in CsPbBr3 Microcrystals

AU - Vandenwijngaerden, Jonathan

AU - Pradhan, Bapi

AU - Van Hout, Bob

AU - Fron, Eduard

AU - Araki, Yasuyuki

AU - Zhang, Xianjun

AU - Shibata, Yutaka

AU - Santantonio, Dario

AU - Bresoli-Obach, Roger

AU - Nonell, Santi

AU - Yuan, Haifeng

AU - Xu, Jialiang

AU - Van der Auweraer, Mark

AU - Roeffaers, Maarten

AU - Hofkens, Johan

AU - Fukumura, Hiroshi

AU - Debroye, Elke

PY - 2025/4/10

Y1 - 2025/4/10

N2 - In this study, we report the first observation of a near-infrared (NIR) emission band from all-inorganic CsPbBr3 and CsPb(Br/Cl)3 perovskite microcrystals. By means of temperature- and power-dependent NIR and visible luminescence spectroscopy, we demonstrate that a fraction of the excited states in these materials relax through radiative transitions involving traps located deep within the band gap, leading to broadband NIR emission. The quantum yield of this deep trap emission is quantitatively determined for the first time and amounts to approximately 0.3% at room temperature. Furthermore, by examining the picosecond-to-nanosecond dynamics of the excited states, using time-resolved luminescence spectroscopy, we observe that the population of NIR initial states occurs on a 660 ps time scale, consistent with the capture of free carriers by deep trap sites. Hence, this work deepens our fundamental understanding of previously unexplored recombination channels in metal halide perovskite microcrystals.

AB - In this study, we report the first observation of a near-infrared (NIR) emission band from all-inorganic CsPbBr3 and CsPb(Br/Cl)3 perovskite microcrystals. By means of temperature- and power-dependent NIR and visible luminescence spectroscopy, we demonstrate that a fraction of the excited states in these materials relax through radiative transitions involving traps located deep within the band gap, leading to broadband NIR emission. The quantum yield of this deep trap emission is quantitatively determined for the first time and amounts to approximately 0.3% at room temperature. Furthermore, by examining the picosecond-to-nanosecond dynamics of the excited states, using time-resolved luminescence spectroscopy, we observe that the population of NIR initial states occurs on a 660 ps time scale, consistent with the capture of free carriers by deep trap sites. Hence, this work deepens our fundamental understanding of previously unexplored recombination channels in metal halide perovskite microcrystals.

KW - Perovskite

KW - Spectroscopy

KW - Stability

KW - Energy

KW - Quantum dots

KW - Photoluminescence

KW - Hybrid

KW - Photosystem-ii

KW - Kinetics

KW - Lead bromide

UR - http://www.scopus.com/inward/record.url?scp=105001495540&partnerID=8YFLogxK

UR - http://hdl.handle.net/20.500.14342/5265

U2 - 10.1021/acs.jpclett.5c00545

DO - 10.1021/acs.jpclett.5c00545

M3 - Article

AN - SCOPUS:105001495540

SN - 1948-7185

VL - 16

SP - 3491

EP - 3500

JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 14

ER -