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

Wu, Hua; Zhang, Yu; Lu, Min; Zhang, Xiaoyu; Sun, Chun; Zhang, Tieqiang; Colvin, Vicki L.; Yu, William W.

doi:10.1039/c7nr09126e

Cited by 122 publications

(94 citation statements)

References 41 publications

(35 reference statements)

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“…In addition, the reaction conditions showed effects on the absorption properties of the assynthesized samples ( Figure S4). There was an absorption tail on the longer-wavelength sides of all the NCs with different reaction conditions, which may have been due to the existence of some defect states [26][27][28].…”

Section: Resultsmentioning

confidence: 99%

Colloidal synthesis of lead-free all-inorganic Cs₃Sb₂Br_xI_9-x nanocrystals

Gan

Lou

Wang

2019

Journal of Information Display

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Environment-friendly lead-free perovskite nanocrystals (NCs) are highly desirable in terms of optoelectronic applications. Reported herein is the synthesis of perovskite-related Cs 3 Sb 2 Br 9 NCs through a simple hot-injection approach. The morphologies and optical properties of NCs were controlled and optimized by varying the reaction temperature, time, and volume of surface ligands. Meanwhile, the Cs 3 Sb 2 Br 9 NCs showed bandgap emission in the blue region centered at 470 nm, and 63 nm full width at half maximum (FWHM). In addition, the Cs 3 Sb 2 Br 9 NCs displayed high stability when immersed in a polar solvent like ethanol. It was also found that the bandgaps of the Cs 3 Sb 2 Br x I 9−x NCs could be adjusted by regulating the composition of halogen.

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Section: Resultsmentioning

confidence: 99%

Colloidal synthesis of lead-free all-inorganic Cs₃Sb₂Br_xI_9-x nanocrystals

Gan

Lou

Wang

2019

Journal of Information Display

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“…[ 6–12 ] Many efforts, like doping, [ 13–15 ] alloying, [ 16 ] or post‐treatment [ 17,18 ] have been taken to enhance their PL QYs. Diverse approaches have been proposed to boost the performance of QD‐LEDs via surface passivation, [ 19 ] modification of carrier transport layer, [ 20–22 ] and anion exchange. [ 12 ] QD‐LEDs have therefore demonstrated an impressive quick increase of peak external quantum efficiencies (EQEs) from 0.01% to 21.3% within 4 years, suggesting perovskite QDs as promising new‐generation optoelectronic semiconductor materials.…”

Section: Introductionmentioning

confidence: 99%

Low Roll‐Off Perovskite Quantum Dot Light‐Emitting Diodes Achieved by Augmenting Hole Mobility

Wang

Teng

et al. 2020

Adv Funct Materials

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The external quantum efficiencies (EQEs) of perovskite quantum dot lightemitting diodes (QD-LEDs) are close to the out-coupling efficiency limitation. However, these high-performance QD-LEDs still suffer from a serious issue of efficiency roll-off at high current density. More injected carriers produce photons less efficiently, strongly suggesting the variation of ratio between radiative and non-radiative recombination. An approach is proposed to balance the carrier distribution and achieve high EQE at high current density. The average interdot distance between QDs is reduced and this facilitates carrier transport in QD films and thus electrons and holes have a balanced distribution in QD layers. Such encouraging results augment the proportion of radiative recombination, make devices with peak EQE of 12.7%, and present a great device performance at high current density with an EQE roll-off of 11% at 500 mA cm −2 (the lowest roll-off known so far) where the EQE is still over 11%.their PL QYs. Diverse approaches have been proposed to boost the performance of QD-LEDs via surface passivation, [19] modification of carrier transport layer, [20][21][22] and anion exchange. [12] QD-LEDs have therefore demonstrated an impressive quick increase of peak external quantum efficiencies (EQEs) from 0.01% to 21.3% within 4 years, suggesting perovskite QDs as promising new-generation optoelectronic semiconductor materials. [6,7,12,21] In spite of the rapid development of perovskite QD-LEDs, at present, the EQEs of these devices tend to be acquired at low current density and manifest significant loss at higher current density, which is known as efficiency roll-off. In best-performed perovskite QD-LEDs, [12] the maximum EQE was obtained at a current density lower than 1 mA cm −2 ; when the current density reached 100 mA cm −2 , the EQE became only about 1%, indicating the efficiency loss reached 95%. Such efficiency loss actually limits achievable brightness and leads to excessive power consumption.Apart from perovskite QD-LEDs, perovskite film-LEDs present similar issues and recently, a few studies have come up with several methods to minimize EQE droop. Zou et al. and Yang et al. concluded that it was luminescence quenching caused by Auger recombination that was responsible for the efficiency roll-off. [23,24] To reduce carrier density in quantum wells (QWs), increased QW width was acquired via different

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“…Metal halide perovskites 1 have emerged among the superior materials for optoelectronic devices [2][3][4] including light-emitting diodes, 4 solar cells, 5,6 photodetectors, lasers, and in light harvesting. 2,3,[8][9][10][11][12] The efficacy of these applications relies on good absorption characteristics, easy charge carrier formation and transport in these materials. 2,[13][14][15] Besides, the low-cost solution synthesis of these perovskite nanocrystals (PNCs) results in intense uorescence and nearly unity quantum yield.…”

Section: Introductionmentioning

confidence: 99%

Charge transfer between lead halide perovskite nanocrystals and single-walled carbon nanotubes

et al. 2020

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

Cited by 122 publications

References 41 publications

Colloidal synthesis of lead-free all-inorganic Cs₃Sb₂Br_xI_9-x nanocrystals

Colloidal synthesis of lead-free all-inorganic Cs₃Sb₂Br_xI_9-x nanocrystals

Low Roll‐Off Perovskite Quantum Dot Light‐Emitting Diodes Achieved by Augmenting Hole Mobility

Charge transfer between lead halide perovskite nanocrystals and single-walled carbon nanotubes

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

Cited by 122 publications

References 41 publications

Colloidal synthesis of lead-free all-inorganic Cs3Sb2BrxI9-x nanocrystals

Colloidal synthesis of lead-free all-inorganic Cs3Sb2BrxI9-x nanocrystals

Low Roll‐Off Perovskite Quantum Dot Light‐Emitting Diodes Achieved by Augmenting Hole Mobility

Charge transfer between lead halide perovskite nanocrystals and single-walled carbon nanotubes

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Colloidal synthesis of lead-free all-inorganic Cs₃Sb₂Br_xI_9-x nanocrystals

Colloidal synthesis of lead-free all-inorganic Cs₃Sb₂Br_xI_9-x nanocrystals