Spatially resolved fluorescence of caesium lead halide perovskite supercrystals reveals quasi-atomic behavior of nanocrystals

被引：23

作者：

Lapkin, Dmitry ^{[1
]}

Kirsch, Christopher ^{[2
]}

Hiller, Jonas ^{[2
]}

Andrienko, Denis ^{[3
]}

Assalauova, Dameli ^{[1
]}

Braun, Kai ^{[2
]}

Carnis, Jerome ^{[1
]}

Kim, Young Yong ^{[1
]}

Mandal, Mukunda ^{[3
]}

Maier, Andre ^{[2
,4
]}

Meixner, Alfred J. ^{[2
,4
]}

Mukharamova, Nastasia ^{[1
]}

Scheele, Marcus ^{[2
,4
]}

Schreiber, Frank ^{[4
,5
]}

Sprung, Michael ^{[1
]}

Wahl, Jan ^{[2
]}

Westendorf, Sophia ^{[2
]}

Zaluzhnyy, Ivan A. ^{[5
]}

Vartanyants, Ivan A. ^{[1
,6
]}

机构：

[1] DESY, Notkestr 85, D-22607 Hamburg, Germany

[2] Univ Tubingen, Inst Phys & Theoret Chem, Morgenstelle 18, D-72076 Tubingen, Germany

[3] Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany

[4] Univ Tubingen, Ctr Light Matter Interact Sensors & Analyt LISA, Morgenstelle 15, D-72076 Tubingen, Germany

[5] Univ Tubingen, Inst Angew Phys, Morgenstelle 10, D-72076 Tubingen, Germany

[6] Natl Res Nucl Univ MEPhI, Moscow Engn Phys Inst, Kashirskoe Shosse 31, Moscow 115409, Russia

来源：

NATURE COMMUNICATIONS | 2022年 / 13卷 / 01期

基金：

俄罗斯科学基金会;

关键词：

PHOTOLUMINESCENCE; LUMINESCENCE; SUPERLATTICE; EMISSION; LIFETIME; DENSITY; IMPACT;

D O I：

10.1038/s41467-022-28486-3

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

By utilizing spatially resolved fluorescence (-lifetime) measurements and high precision X-ray nanodiffraction, the authors correlate the influence of structural misalignment and fluorescence (-lifetime) properties of all-inorganic CsPbX3 (X- = Br-, Cl-) perovskite superlattices. We correlate spatially resolved fluorescence (-lifetime) measurements with X-ray nanodiffraction to reveal surface defects in supercrystals of self-assembled cesium lead halide perovskite nanocrystals and study their effect on the fluorescence properties. Upon comparison with density functional modeling, we show that a loss in structural coherence, an increasing atomic misalignment between adjacent nanocrystals, and growing compressive strain near the surface of the supercrystal are responsible for the observed fluorescence blueshift and decreased fluorescence lifetimes. Such surface defect-related optical properties extend the frequently assumed analogy between atoms and nanocrystals as so-called quasi-atoms. Our results emphasize the importance of minimizing strain during the self-assembly of perovskite nanocrystals into supercrystals for lighting application such as superfluorescent emitters.

引用

页数：10

共 58 条

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