Bright-Exciton Fine-Structure Splittings in Single Perovskite Nanocrystals

Yin, Chunyang; Chen, Liyang; Song, Nan; Lv, Yan; Hu, Fu-Gang; Sun, Chun; Yu, William W.; Zhang, Chunfeng; Wang, Xiaoyong; Xiao, Min

doi:10.1103/physrevlett.119.026401

Cited by 139 publications

(202 citation statements)

References 55 publications

(74 reference statements)

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“…18,38,39 Firstly, a Cs-oleate precursor was prepared. Cs 2 CO 3 (0.8 g), oleic acid (OA, 2.5 mL) and ODE (30.0 mL) were mixed in a three-neck flask.…”

Section: Methodsmentioning

confidence: 99%

Surface ligand modification of cesium lead bromide nanocrystals for improved light-emitting performance

Zhang

et al. 2018

Nanoscale

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122

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Cesium lead halide perovskite nanocrystals (NCs) possess excellent optical properties at visible wavelengths with great promise for applications in luminous display fields. We demonstrate a method to modify the surface ligand passivation of perovskite NCs for enhanced colloidal stability and emitting properties by incorporating didodecyl dimethyl ammonium bromide (DDAB). The photoluminescence quantum yield of the NC solution was improved to 96% from 70% and the perovskite film showed fewer trapped sites and enhanced carrier transport ability. The thus fabricated electroluminescent perovskite NC-LEDs exhibited a bright luminance of 11 990 cd m−2, corresponding to 4-times improved external quantum efficiency (EQE), compared to the control device using regular NCs without DDAB.

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“…18,38,39 Firstly, a Cs-oleate precursor was prepared. Cs 2 CO 3 (0.8 g), oleic acid (OA, 2.5 mL) and ODE (30.0 mL) were mixed in a three-neck flask.…”

Section: Methodsmentioning

confidence: 99%

Surface ligand modification of cesium lead bromide nanocrystals for improved light-emitting performance

Zhang

et al. 2018

Nanoscale

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122

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“…FS splittings in emission lines of inorganic perovskite NCs are observed to vary from several hundred µeV (e.g., Ref. [48]) to a few meV (e.g., Ref. [30]).…”

Section: B Bi-exciton and Trion Shiftsmentioning

confidence: 99%

Calculation of the biexciton shift in nanocrystals of inorganic perovskites

2020

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We calculate the shift in emission frequency of the trion and biexciton (relative to that of the single exciton) for nanocrystals (NCs) of inorganic perovskites CsPbBr3 and CsPbI3. The calculations use an envelope-function k · p model combined with self-consistent Hartree-Fock and a treatment of the intercarrier correlation energy in the lowest (second) order of many-body perturbation theory. The carriers in the trion and biexciton are assumed to have relaxed nonradiatively to the ground state at the band edge before emission occurs. The theoretical trion shifts for both CsPbBr3 and CsPbI3 are found to be in fair agreement with available experimental data, which include low-temperature single-dot measurements, though are perhaps systematically small by a factor of order 1.5, which can plausibly be explained by a combination of a slightly overestimated dielectric constant and omitted third-and higher-order terms in the correlation energy. Taking this level of agreement into account, we estimate that the ground-state biexciton shift for CsPbBr3 is a redshift of order 10-20 meV for NCs with an edge-length of 12 nm. This value is intermediate among the numerous high-temperature measurements on NCs of CsPbBr3, which vary from large redshifts of order 100 meV to blueshifts of several meV.

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“…1–5 As a result of the rapid progress in improving device architectures and compositional engineering, the external quantum efficiencies (EQE) of the perovskite NC-based LEDs have exceeded 8%. 6,7 However, there is still a room for improvement of these devices as compared with LEDs utilizing traditional II–VI semiconductor quantum dots, where best EQE values currently reach 20%.…”

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Spontaneous Silver Doping and Surface Passivation of CsPbI₃ Perovskite Active Layer Enable Light-Emitting Devices with an External Quantum Efficiency of 11.2%

et al. 2018

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Lead halide perovskite nanocrystals are currently under intense investigation as components of solution-processed light-emitting devices (LEDs). We demonstrate LEDs based on Ag doped–passivated CsPbI3 perovskite nanocrystals with external quantum efficiency of 11.2% and an improved stability. Ag and trilayer MoO3/Au/MoO3 structure were used as cathode and anode, respectively, which reduce the electron injection barrier and ensure the high transparency and low resistance of the anode. Silver ions diffuse into perovskite film from the Ag electrode, as confirmed by the elemental mapping, the presence of Ag 3d peaks in the X-ray photoelectron spectrum, and the peak shift in the X-ray diffraction patterns of CsPbI3. In addition to doping, silver ions play the beneficial role of passivating surface defect states of CsPbI3 nanocrystals, which results in increased photoluminescence quantum yield, elongated emission lifetime, and improved stability of perovskite films.

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Bright-Exciton Fine-Structure Splittings in Single Perovskite Nanocrystals

Cited by 139 publications

References 55 publications

Surface ligand modification of cesium lead bromide nanocrystals for improved light-emitting performance

Surface ligand modification of cesium lead bromide nanocrystals for improved light-emitting performance

Calculation of the biexciton shift in nanocrystals of inorganic perovskites

Spontaneous Silver Doping and Surface Passivation of CsPbI₃ Perovskite Active Layer Enable Light-Emitting Devices with an External Quantum Efficiency of 11.2%

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Bright-Exciton Fine-Structure Splittings in Single Perovskite Nanocrystals

Cited by 139 publications

References 55 publications

Surface ligand modification of cesium lead bromide nanocrystals for improved light-emitting performance

Surface ligand modification of cesium lead bromide nanocrystals for improved light-emitting performance

Calculation of the biexciton shift in nanocrystals of inorganic perovskites

Spontaneous Silver Doping and Surface Passivation of CsPbI3 Perovskite Active Layer Enable Light-Emitting Devices with an External Quantum Efficiency of 11.2%

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Product

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Spontaneous Silver Doping and Surface Passivation of CsPbI₃ Perovskite Active Layer Enable Light-Emitting Devices with an External Quantum Efficiency of 11.2%