Highly Efficient Perovskite‐Quantum‐Dot Light‐Emitting Diodes by Surface Engineering

Inorganic perovskite quantum dots bear many unique properties that make them potential candidates for optoelectronic applications, including color display and lighting. However, the white emission with inorganic perovskite quantum dots has rarely been realized due to the anion-exchange reaction. Here, we proposed a one-pot preparation to fabricate inorganic perovskite quantum dot-based white light-emitting composites by introducing anthracene as a blue emission component. The as-prepared white light-emitting composite exhibited a photoluminescence quantum yield of 41.9%. By combining CsPb(Br/I)3@anthracene composites with UV light-emitting device (LED) chips, white light-emitting devices with a color rendering index of 90 were realized with tunable color temperature from warm white to cool white. These results can promote the application of inorganic perovskite quantum dots in the field of white LEDs.

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“…These results indicated that the composites are consisted of perovskite QDs and anthracene crystals. 3 …”

Section: Resultsmentioning

confidence: 99%

Efficient and Stable CsPb(Br/I)₃@Anthracene Composites for White Light-Emitting Devices

Shen

Sun

Bai

et al. 2018

ACS Appl. Mater. Interfaces

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“…Recently, Pan et al utilized a ligand-exchange method to replace the long ligands with shorter ligands to enhance the performances of perovskite NC-LEDs greatly. 28 Moreover, Yassitepe et al proposed a strategy that utilized tetraoctylammonium halides to prepare CsPbX 3 NCs, eliminating the use of oleylamine and enhancing the colloidal stability of the solution. 23 Inspired by the solution-phase ligand exchange in chalcogenide quantum dots, 29 we tried to use a mixture of oleylamine/DDAB to modify the surface passivation of NCs.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

et al. 2018

Nanoscale

127

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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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“…Originally, perovskites of the generic formula, CH 3 NH 3 PbX 3 (X=I, Br, Cl), have been utilized to replace conventional sensitizers in dye-sensitized solar cells (DSSCs) where they were used for absorbing the sun light spectrum. [5][6][7][8] However, soon after it has been realized that perovskites are characterized by good electronic and optoelectronic properties, [9][10][11][12][13][14][15][16] that can be exploited for advancing thin-film and low-dimensional [17][18][19][20][21] versions of solar cells, as well as for developing perovskite-based light emitting diodes (LEDs) [22][23][24] and lasers. [25][26][27][28][29][30] The rapid progress in the field of perovskites has also raised certain questions concerning fundamental properties of these materials, particularly about phenomena associated with lowdimensional effects and size-dependent properties of perovskite nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of a structural phase transition in one-dimensional organometal halide perovskite nanorods grown inside porous silicon nanotube templates

et al. 2017

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One-dimensional organo-metal halide Perovskite (CH 3 NH 3 PbI 3 ) nanorods whose diameter and length are dictated by the inner size of porous silicon nanotube templates have been grown, characterized and compared to bulk perovskites in the form of microwires. We have observed a structural phase transition for bulk perovskites, where the crystal structure changes from tetragonal to orthorhombic at about 150K, as opposed to small diameter one-dimensional perovskite nanorods, of the order of 30-70 nm in diameter, where the phase transition is inhibited and the dominant phase remains tetragonal. Two major experimental techniques, infrared absorption spectroscopy and photoluminescence, were utilized to probe the temperature dependence of the perovskite phases over the 4-300K temperature range.Yet, different characteristics of the phase transition were measured by the two spectroscopic methods and explained by the presence of small, tetragonal inclusions embedded in the orthorhombic phase. The inhibition of the phase transition is attributed to the large surface area of these one-dimensional perovskite nanorods, which gives rise to a large stress that, in turn, prevents the formation of the orthorhombic phase. The absence of phase transition enables the measurement of the tetragonal bandgap energy down to low temperatures. *

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Highly Efficient Perovskite‐Quantum‐Dot Light‐Emitting Diodes by Surface Engineering

Cited by 983 publications

References 54 publications

Efficient and Stable CsPb(Br/I)₃@Anthracene Composites for White Light-Emitting Devices

Efficient and Stable CsPb(Br/I)₃@Anthracene Composites for White Light-Emitting Devices

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

Inhibition of a structural phase transition in one-dimensional organometal halide perovskite nanorods grown inside porous silicon nanotube templates

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Highly Efficient Perovskite‐Quantum‐Dot Light‐Emitting Diodes by Surface Engineering

Cited by 983 publications

References 54 publications

Efficient and Stable CsPb(Br/I)3@Anthracene Composites for White Light-Emitting Devices

Efficient and Stable CsPb(Br/I)3@Anthracene Composites for White Light-Emitting Devices

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

Inhibition of a structural phase transition in one-dimensional organometal halide perovskite nanorods grown inside porous silicon nanotube templates

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Product

Resources

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Efficient and Stable CsPb(Br/I)₃@Anthracene Composites for White Light-Emitting Devices

Efficient and Stable CsPb(Br/I)₃@Anthracene Composites for White Light-Emitting Devices