Slow Auger Recombination of Charged Excitons in Nonblinking Perovskite Nanocrystals without Spectral Diffusion

Hu, Fu-Gang; Yin, Chunyang; Zhang, Huichao; Sun, Chun; Yu, William W.; Zhang, Chunfeng; Wang, Xiaoyong; Xiao, Min

doi:10.1021/acs.nanolett.6b02874

Cited by 143 publications

(149 citation statements)

References 48 publications

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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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129

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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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129

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“…[43,[49][50][51] However, they usually suffer from rapid nonradiative Auger recombination, which exhibits faster decay than excitons. The first possibility is the formation of trions, i.e., charged excitons, and the second to dark excitons.…”

Section: Exciton-biexciton Splitting and Influence Of Exciton Dark Anmentioning

confidence: 99%

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Fang

Yang

Adjokatse

et al. 2019

Adv Funct Materials

118

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2D perovskite materials have recently reattracted intense research interest for applications in photovoltaics and optoelectronics. As a consequence of the dielectric and quantum confinement effect, they show strongly bound and stable excitons at room temperature. Here, the band-edge exciton fine structure and in particular its exciton and biexciton dynamics in high quality crystals of (PEA) 2 PbI 4 are investigated. A comparison of bulk and surface exciton lifetimes yields a room temperature surface recombination velocity of 2 × 10 3 cm s −1 and an intrinsic lifetime of 185 ns. Biexciton emission is evidenced at room temperature, with a binding energy of ≈45 meV and a lifetime of 80 ps. At low temperature, exciton state splitting is observed, which is caused by the electron-hole exchange interaction. Transient photoluminescence resolves the low-lying dark exciton state, with a bright/dark splitting energy estimated to be 10 meV. This work contributes to the understanding of the complex scenario of the elementary photoexcitations in 2D perovskites. materials such as transition metal dichalcogenides, phosphorene, and graphene. They can be easily grown by both solution methods and vapor transport methods at low temperature, [14][15][16][17] with a tunable bulk direct bandgap. [18] These advantages make them appealing for future optoelectronic and photonic applications.Unlike their 3D counterparts, the dielectric and quantum confinement of carriers in the 2D perovskite layers gives rise to unusually strong excitonic effects. [19,20] It has been experimentally observed that excitons are tightly confined in the inorganic layers with binding energy as high as a few hundred millielectronvolts (significantly higher than that of 3D perovskites). [21] This greatly enhanced exciton binding energy makes them particularly interesting for light-emitting applications. [8,22] Moreover, 2D perovskites can exhibit a variety of multiexciton species, including biexcitons and trions. [20,23,24] The presence of these quasiparticles is exciting due to their unique role, leading to a better understanding of many body effects and their great promise for photonic applications. In addition, recent experiments reveal an important role of electron-phonon couplings on the exciton dynamics in 2D lead-iodide perovskite, suggesting a complex scenario for carrier relaxation and exciton formation. [25,26] It is therefore crucial to understand elementary photoexcitations in these layered materials. However, exciton fine structures and their properties are usually masked by local energy fluctuations resulting from disorder in thin films or broad emission due to the formation of self-trapped excitons. [27] Whereas their steady-state optical properties have

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“…Using combinations of different optical techniques, we can easily understand PLQY properties and decay dynamics of excitons. Hu et al studied exciton decay dynamics, such as Auger recombination and PLQY blinking, using transient absorption (TA) and PLQY measurement. Makarov et al used time‐resolved PLQY spectroscopies (TRPL) and TA spectroscopies to discuss PQD characteristics, such as absorption cross‐sections, radiative lifetimes, and nonradiative Auger decay.…”

Section: Optical Properties and Application In Ledsmentioning

confidence: 99%

Perovskite Quantum Dots and Their Application in Light‐Emitting Diodes

Wang

Bao

Tsai

et al. 2017

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Perovskite quantum dots (PQDs) attract significant interest in recent years because of their unique optical properties, such as tunable wavelength, narrow emission, and high photoluminescence quantum efficiency (PLQY). Recent studies report new types of formamidinium (FA) PbBr PQDs, PQDs with organic-inorganic mixed cations, divalent cation doped colloidal CsPb M Br PQDs (M = Sn , Cd , Zn , Mn ) featuring partial cation exchange, and heterovalent cation doped into PQDs (Bi ). These PQD analogs open new possibilities for optoelectronic devices. For commercial applications in lighting and backlight displays, stability of PQDs requires further improvement to prevent their degradation by temperature, oxygen, moisture, and light. Oxygen and moisture-facilitated ion migration may easily etch unstable PQDs. Easy ion migration may result in crystal growth, which lowers PLQY of PQDs. Surface coating and treatment are important procedures for overcoming such factors. In this study, new types of PQDs and a strategy of improving their stabilities are introduced. Finally, this paper discusses future applications of PQDs in light-emitting diodes.

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Slow Auger Recombination of Charged Excitons in Nonblinking Perovskite Nanocrystals without Spectral Diffusion

Cited by 143 publications

References 48 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

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Perovskite Quantum Dots and Their Application in Light‐Emitting Diodes

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