High brightness formamidinium lead bromide perovskite nanocrystal light emitting devices

Perumal, Ajay; Shendre, Sushant; Li, Mingjie; Tay, Yong Kang Eugene; Sharma, Vijay Kumar; Chen, Shi; Wei, Zhanhua; Liu, Qing; Gao, Yuan; Buenconsejo, Pio John S.; Tan, Swee Tiam; Gan, Chee Lip; Xiong, Qihua; Sum, Tze Chien; Demir, Hilmi Volkan

doi:10.1038/srep36733

Cited by 145 publications

(135 citation statements)

References 61 publications

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“…Figure 3c shows the data of TRPL from T = 100 K to T = 10 K; it is evident that PL decay rate is almost independent of temperature ( Table 1). [25,26] We believe, such shallow defect states are in general associated with surface states in colloidal quantum dots. The increased PL decay time with temperature has also been reported for Hybrid perovskite films, [35] as well as CH 3 NH 3 PbI 3 (methylammonium lead iodide) NCs, FAPbBr 3 (formamidinium lead bromide) NCs.…”

Section: T Imentioning

confidence: 92%

“…[6] However, high reaction temperature processing with proper surface passivation (core-shell) arrangement to suppress nonradiative (NR) recombination centers are limiting their performances. [26] To explain this phenomenon, TRPL spectroscopy as a function of temperature is carried out, which suggests a red-shifted (≈75 ± 15 meV) defect-induced emission at longer times. [26] To explain this phenomenon, TRPL spectroscopy as a function of temperature is carried out, which suggests a red-shifted (≈75 ± 15 meV) defect-induced emission at longer times.…”

Section: Introductionmentioning

confidence: 99%

“…[1] Among various colloidal quantum dots, cadmium and lead chalcogenides based quantum dots are highly studied for light-emitting diodes, [2] lasing, [3] solar cells, [4] photodetectors, [5] and bioimaging applications. [7] The tremendous success of bulk hybrid (MAPbX 3 ; MA = CH 3 NH 3 , X = Cl, Br, I) perovskite [8] has motivated the scientists to go for colloidal quantum dots with different sizes and shapes, covering been found in the case of CH 3 NH 3 PbI 3 (methylammonium lead iodide) NCs [25,26] and FAPbBr 3 (formamidinium lead bromide) NCs. [7] The tremendous success of bulk hybrid (MAPbX 3 ; MA = CH 3 NH 3 , X = Cl, Br, I) perovskite [8] has motivated the scientists to go for colloidal quantum dots with different sizes and shapes, covering been found in the case of CH 3 NH 3 PbI 3 (methylammonium lead iodide) NCs [25,26] and FAPbBr 3 (formamidinium lead bromide) NCs.…”

Section: Introductionmentioning

confidence: 99%

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Role of Localized States in Photoluminescence Dynamics of High Optical Gain CsPbBr₃ Nanocrystals

Dey

Rathod

Kabra

2018

Advanced Optical Materials

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the visible to near-IR wavelengths of the electromagnetic spectrum. [9,10] Though organic-inorganic metal halides based perovskites can produce high photoluminescence (PL) yield, their instability makes it difficult for practical use. On the other side, all inorganic perovskite, e.g., cesium lead halides (CsPbX 3 ), based colloidal quantum dots attract much attention due to its very high PL yield (PLQY ≈ 90%), [11] narrow emission peak (enhanced color purity), low trap density, and reduced blinking [12] with high stability. Recent studies show ultralow threshold density (≈4.5 µJ cm −2 ) for amplified spontaneous emission (ASE) in CsPbBr 3 nanocrystals (NCs) film. [13,14] In past few years the successful employment of CsPbBr 3 quantum dots as light-emitting diodes, [9] single photon emitter, [15] advanced lasing material, [13] and photodetectors [16] make it necessary to have an in-depth study of different photophysical processes in this material. Some recent studies have been devoted to investigating excitonic recombination processes in this material at ultrafast timescale. [17] To date, most of these studies have been done at room temperature (RT). However, to understand the photoexcited carrier dynamics, temperature-dependent time-resolved PL (TRPL) study is an essential tool. Since PL lifetime can be significantly affected by the presence of surface traps, temperature-dependent TRPL gives us an insight of the trap-related kinetics in the NC. [18] Some recent studies [19,20] of the fine structure analysis of the excitonic and PL spectra of CsPbX 3 (X = Cl, Br, I) NCs show the presence of trion formation at low T. These trions are red-shifted by few meV from free excitons peak and decay radiatively with much faster rate than the excitons which results in faster PL decay at low T. [19,21] It has also been argued that the lowest triplet excitonic states are bright (emission red-shifted by few meV) in this material which is the cause of the higher photon emission rate. [22] Here, we have studied temperature-dependent TRPL decay of CsPbBr 3 NCs along with the steady-state absorption and PL to get insight into the influence of surface trap states on the emission kinetics in highly luminescent NCs. From timeresolved emission spectroscopy, we have found that the PL decaying faster at low temperature is in contrast to many other colloidal NCs such as PbS and CdS, [23,24] where PL lifetime gets extended by lowering the temperature. However, similar lengthening of PL lifetimes at elevated temperatures has also Temperature-dependent time-resolved photoluminescence (TRPL) spectroscopy of high optical gain CsPbBr 3 nanocrystals (NCs) films along with temperaturedependent steady-state absorption and photoluminescence (PL) spectra is studied. A red shift in the optical band edge and the corresponding PL peak is observed by lowering the temperature from room temperature, analogous to hybrid perovskite semiconductors. However, the faster PL decay of CsPbBr 3 NCs film at a low temperature as compared to room temperature is in con...

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Section: T Imentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of Localized States in Photoluminescence Dynamics of High Optical Gain CsPbBr₃ Nanocrystals

Dey

Rathod

Kabra

2018

Advanced Optical Materials

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“…[43] Several small-angle X-ray scattering (SAXS) methods exist which enable the determination of the diameter of dispersed perovskite nanocrystals with an average size of 10-15 nm, e.g., evaluation of the pair distance distribution function, which is obtained through modified Fourier transformations of the SAXS data. [44] Most of the reported x-ray studies are however classical crystallography experiments with the goal of determining the details of crystal structure. Powder XRD enables a distinction between crystal structures typical for perovskites (cubic, tetragonal, and orthorhombic).…”

Section: Characterization Methodsmentioning

confidence: 99%

Advances in Quantum‐Confined Perovskite Nanocrystals for Optoelectronics

Polavarapu

Nickel

Feldmann

et al. 2017

Advanced Energy Materials

190

162

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bivalent cation (Pb 2+ , Sn 2+ or Ge 2+ ) enveloped by an octahedron comprising six halide ions (XCl − , Br − or I − ) with A being a monovalent cation (e.g., CH 3 NH 3 + , NH 2 CHNH 2 + , or Cs + ) residing in between these corner sharing octahedra. [13,14] These components not only dictate the crystal structure, but also control their optical and electronic properties. [2,15] Exemplary is the optical bandgap, which can be tuned throughout the visible range by controlling the halide content. Halide perovskites can form two-dimensional (2D) or quasi-2D layered structures with thickness of one or a few octahedral layers. [16] The reduced thickness of these layers leads to quantum confinement effects, which changes their optical properties significantly in comparison with their three-dimensional (3D) counterparts, as studied since the 80's on thin film perovskites. [17] Recent studies have shown that nanocrystalline perovskites exhibit enhanced PLQYs and offer tunable optical properties not only through their constituent ions but also through their size. [3,[8][9][10][11]15,18,19] Quantum size effects, as illustrated in Figure 1a, have been extensively investigated in conventional semiconductor nanocrystals such as metal chalcogenides and utilized for a wide range of applications during the last two decades. [20] As the size of the nanocrystals approaches the exciton Bohr radius of the material, quantum confinement effects start to influence the excitonic wave function and the energetic states of the exciton, leading to blueshifted photoluminescence (Figure 1a). Precise control of colloidal semiconductor nanocrystal size has enabled the tuning of the PL emission over wide wavelength ranges. Similarly, perovskite nanocrystals of reduced dimensionality exhibit quantum confinement effects, as shown for the case of nanoplatelets in 2015. [8][9][10]21,22] Despite recent advances, an accurate understanding of thickness-and dimensionality-dependent optical properties of perovskite nanocrystals still proves elusive due to difficulties in the controlled syntheses and characterization of their dimensions. Additionally, while many recent publications present perovskite nanocrystals, most of these show negligible or no quantum confinement. [23,24] Here we will provide a concise overview of quantum confinement effects in perovskite nanocrystals, highlighting synthetic methods and resulting properties, characterization methods and finally applications for these enticing nanostructures.Metal halide perovskites have emerged as a promising new class of layered semiconductor material for light-emitting and photovoltaic applications owing to their outstanding optical and optoelectronic properties. In nanocrystalline form, these layered perovskites exhibit extremely high photoluminescence quantum yields (PLQYs) and show quantum confinement effects analogous to conventional semiconductors when their dimensions are reduced to sizes comparable to their respective exciton Bohr radii. The reduction in size leads to strongly blueshifted ...

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“…( Table 1 ). Electrical driving almost does not change the superior optical features of LHP‐NCs as emitters in the resulting LEDs, including their high color purity, a wide color gamut, and a stable spectrum that is independent of the applied driving voltage . Under electrical excitation, LHP‐NCs consisting of mixed halides would undergo spectral splitting; however, RGB primary color LEDs that use single‐halide LHP‐NC emitters still exhibit a wide color gamut that can display most natural colors in resulting full color displays.…”

Section: Leds Exploiting Lhp‐nc Emittersmentioning

confidence: 99%

Light Generation in Lead Halide Perovskite Nanocrystals: LEDs, Color Converters, Lasers, and Other Applications

Yan

Tan

et al. 2019

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Facile solution processing lead halide perovskite nanocrystals (LHP‐NCs) exhibit superior properties in light generation, including a wide color gamut, a high flexibility for tuning emissive wavelengths, a great defect tolerance and resulting high quantum yield; and intriguing electric feature of ambipolar transport with moderate and comparable mobility. As a result, LHP‐NCs have accomplished great achievements in various light generation applications, including color converters for lighting and display, light‐emitting diodes, low threshold lasing, X‐ray scintillators, and single photon emitters. Herein, the considerable progress that has been made thus far is reviewed along with the current challenges and future prospects in the light generation applications of LHP‐NCs.

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High brightness formamidinium lead bromide perovskite nanocrystal light emitting devices

Cited by 145 publications

References 61 publications

Role of Localized States in Photoluminescence Dynamics of High Optical Gain CsPbBr₃ Nanocrystals

Role of Localized States in Photoluminescence Dynamics of High Optical Gain CsPbBr₃ Nanocrystals

Advances in Quantum‐Confined Perovskite Nanocrystals for Optoelectronics

Light Generation in Lead Halide Perovskite Nanocrystals: LEDs, Color Converters, Lasers, and Other Applications

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High brightness formamidinium lead bromide perovskite nanocrystal light emitting devices

Cited by 145 publications

References 61 publications

Role of Localized States in Photoluminescence Dynamics of High Optical Gain CsPbBr3 Nanocrystals

Role of Localized States in Photoluminescence Dynamics of High Optical Gain CsPbBr3 Nanocrystals

Advances in Quantum‐Confined Perovskite Nanocrystals for Optoelectronics

Light Generation in Lead Halide Perovskite Nanocrystals: LEDs, Color Converters, Lasers, and Other Applications

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Role of Localized States in Photoluminescence Dynamics of High Optical Gain CsPbBr₃ Nanocrystals

Role of Localized States in Photoluminescence Dynamics of High Optical Gain CsPbBr₃ Nanocrystals