Giant Photoluminescence Blinking of Perovskite Nanocrystals Reveals Single-Trap Control of Luminescence

Tian, Yuxi; Merdasa, Aboma; Peter, M.; Abdellah, Mohamed; Zheng, Kaibo; Ponseca, Carlito S.; Pullerits, Tõnu; Yartsev, Arkady; Scheblykin, Ivan G.

doi:10.1021/nl5041397

Cited by 186 publications

(346 citation statements)

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“…However, charging of NCs can promote Auger recombination and trap states can bind charge Colloidal lead halide perovskite nanocrystals H Huang et al carriers, preventing recombination, all of which has been considered to contribute to blinking. [102][103][104] Tian et al 98 observed PL blinking from MAPbI 3 nanorods (Figures 8h-j) and attributed it to photo-induced activation and de-activation of PL quenching sites, presumably present at the ends of the rods where formation of geometrical and chemical defects are most likely to occur. Similarly, blinking was also observed in single perovskite MAPbBr 3 NCs and attributed to the presence of charge trapping surface states.…”

Section: Quantum Confinement In Perovskite Ncsmentioning

confidence: 98%

“…However, single-particle measurements are sometimes necessary, in order to obtain accurate correlations between their optical properties and size/morphology. 27,71,[94][95][96][97][98][99] Tian et al 100 provided direct visualization of the photogenerated carrier diffusion in single MAPbBr 3 and MAPbI 3 NWs and nanoplates using time-resolved PL-scanning microscopy (Figures 8a-e). This technique is based on the photoexcitation of a single particle at one specific position and subsequently scanning the substrate at different positions by time-resolved PL as a function of delay time.…”

Section: Quantum Confinement In Perovskite Ncsmentioning

confidence: 99%

“…[96][97][98] Fluorescence intermittency (blinking) has been widely observed in metal-chalcogenide quantum dots, which can remain in so-called 'dark states' for significant times, ranging from microseconds up to several minutes. 101,102 Blinking is generally thought to result from light-driven charging (or ionization) and discharging of the colloidal NC core or of surface electron traps on photoexcitation.…”

Section: Quantum Confinement In Perovskite Ncsmentioning

confidence: 99%

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Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

et al. 2016

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Lead halide perovskite nanocrystals (NCs) are receiving a lot of attention nowadays, due to their exceptionally high photoluminescence quantum yields reaching almost 100% and tunability of their optical band gap over the entire visible spectral range by modifying composition or dimensionality/size. We review recent developments in the direct synthesis and ion exchange-based reactions, leading to hybrid organic-inorganic (CH 3 NH 3 PbX 3 ) and all-inorganic (CsPbX 3 ) lead halide (X = Cl, Br, I) perovskite NCs, and consider their optical properties related to quantum confinement effects, single emission spectroscopy and lasing. We summarize recent developments on perovskite NCs employed as an active material in several applications such as light-emitting devices, solar cells and photodetectors, and provide a critical outlook into the existing and future challenges.

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Section: Quantum Confinement In Perovskite Ncsmentioning

confidence: 98%

Section: Quantum Confinement In Perovskite Ncsmentioning

confidence: 99%

Section: Quantum Confinement In Perovskite Ncsmentioning

confidence: 99%

See 1 more Smart Citation

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

et al. 2016

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“…Examples are the estimation of respective activation energies, the observation of band-bending effects, and capacitance measurements, only to name a few. Mobile ions not only influence the hysteresis in J-V curves [160] but also the emission properties of the perovskite (e.g., photoluminescence, electroluminescence, blinking), they induce capacitive effects, [161][162][163][164][165] and affect transient measurements, respectively. [166] In general, an external electric field drives ions towards the opposite interfaces (perovskite/ETL and perovskite/HTL, respectively).…”

Section: Ion Migrationmentioning

confidence: 99%

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

Petrus

Schlipf

Cheng

et al. 2017

Advanced Energy Materials

304

201

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following statement: These materials can be processed from solution and yet exhibit optoelectronic materials properties described in classic solid-state physics textbooks. This unprecedented combination has led to photovoltaic devices that can be processed at room temperature and achieve performance levels similar to industry giant polycrystalline silicon, from a starting point of 3.8% in 2009. [1][2][3][4] The first light-emitting electrochemical cells [5] and diodes [6][7][8] have also been introduced recently, leading to tunable light emission spectra and internal quantum efficiencies exceeding 15%.The road towards these achievements has been marked by a constant improvement of perovskite deposition techniques fueled by our increasing understanding of the crystallization processes. The choice of deposition technique, either from solution or vapor, and the composition and order in which precursor species are applied has a great influence on the crystallization kinetics. Here, one can distinguish one-step methods where the perovskite is formed from a precursor mixture dissolved in a common solution, and two-step methods where the inorganic compound is deposited first and transformed to the perovskite phase later by addition of the organic constituents. [9][10][11] Furthermore, many parameters during processing can have an effect on the crystallization mechanism and consequently on film morphology, such as the choice of solvents, concentrations and processing additives that are often not incorporated into the final product. [11][12][13] We discuss this aspect in Section 2, where we focus our attention on the most commonly employed solution-based techniques. Additionally, as for any new technology trying to displace an incumbent technology, higher efficiencies, lower costs, reproducibility, stability, and sustainability are paramount. In particular, reproducibility has been a major challenge in perovskite solar cells from the beginning: small variations in morphology, like crystal size, film roughness, and pinholes can have detrimental effects on photovoltaic performance. [14] On the other hand, current-voltage measurements often showed a hysteresis that is rarely seen in other photovoltaic technologies. [15] These topics are highlighted in Sections 3 and 4. Finally, in Section 5 we discuss the framework for market introduction, such as cost reduction by choosing low-cost charge transport layers, or how the lifetime of perovskite absorbers can be extended by the choice of materials composition.Hybrid metal halide perovskites have become one of the hottest topics in optoelectronic materials research in recent years. Not only have they surpassed everyone's expectations and achieved similar performance as tried and true polycrystalline silicon photovoltaic devices, but they are also finding applications in a variety of different fields, including lighting. The main advantages of hybrid metal halide perovskites are simple processability, compatible with large-scale solution processing such as roll-to-roll printing, a...

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“…Although PeNPs showed excitonic behavior due to much improved wavefunction overlap, high E b , and high PLQE at RT and low excitation fluences, and PeNP-LEDs showed the dramatically increasing luminescence efficiencies, large number of surface defects arising from high surface-to-volume ratio (S/V) should be passivated for higher efficiency and stability. ) (73,74,83). These severe PL blinking and numerous surface defects in PeNPs can be prevented by irradiation with light, reaction with Lewis bases, and self-passivation of Pb-halogen composites (e.g., PbBr x ) (73,78,83,84).…”

Section: Next-generation Emitters: Perovskite Nanoparticle Technologymentioning

confidence: 99%

Metal halide perovskite light emitters

Kim

Cho

Lee

2016

Proc. Natl. Acad. Sci. U.S.A.

479

441

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Twenty years after layer-type metal halide perovskites were successfully developed, 3D metal halide perovskites (shortly, perovskites) were recently rediscovered and are attracting multidisciplinary interest from physicists, chemists, and material engineers. Perovskites have a crystal structure composed of five atoms per unit cell (ABX 3 ) with cation A positioned at a corner, metal cation B at the center, and halide anion X at the center of six planes and unique optoelectronic properties determined by the crystal structure. Because of very narrow spectra (full width at half-maximum ≤20 nm), which are insensitive to the crystallite/grain/particle dimension and wide wavelength range (400 nm ≤ λ ≤ 780 nm), perovskites are expected to be promising high-color purity light emitters that overcome inherent problems of conventional organic and inorganic quantum dot emitters. Within the last 2 y, perovskites have already demonstrated their great potential in light-emitting diodes by showing high electroluminescence efficiency comparable to those of organic and quantum dot light-emitting diodes. This article reviews the progress of perovskite emitters in two directions of bulk perovskite polycrystalline films and perovskite nanoparticles, describes current challenges, and suggests future research directions for researchers to encourage them to collaborate and to make a synergetic effect in this rapidly emerging multidisciplinary field.As human civilization went through the information revolution, display technology has been designated as a core technology to increase convenience in daily human life. In an information society, the desire of humans to see the materials more vividly in displays has significantly increased. In this aspect, major trend of the display technology is changing from high resolution and high efficiency to high color purity for realizing vivid natural colors (Fig. 1). Therefore, research on new emitting materials that can emit light with narrow full width at halfmaximum (FWHM) have been attempted. Inorganic quantum dot (QD) emitters with narrow spectra (FWHM ∼30 nm) have been significantly studied following organic emitters (FWHM >40 nm); however, size-sensitive color purity, difficult size uniformity control, and expensive material costs of inorganic QD emitters retard the progress for wide use in industry. Therefore, new emitters with size-insensitively high color purity (FWHM <20 nm) and low material cost should be developed. Among many candidates, metal halide perovskites (hereafter, "perovskites") have gained great attentions and shown the possibility for future high-color purity emitters.The first perovskites were layer-type thin films (A 2 MX 4 ) (A = organic cation; M = divalent metal; X = Cl, Br, I) (1-6).They were expected to be novel hybrid materials that had both advantages of organic materials (e.g., solution processability and low material costs) and inorganic materials (e.g., high charge carrier mobility) (7). Especially, perovskites with high color purity, easy wavelength tuning, and ...

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Giant Photoluminescence Blinking of Perovskite Nanocrystals Reveals Single-Trap Control of Luminescence

Cited by 186 publications

References 52 publications

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

Colloidal lead halide perovskite nanocrystals: synthesis, optical properties and applications

Capturing the Sun: A Review of the Challenges and Perspectives of Perovskite Solar Cells

Metal halide perovskite light emitters

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