Room-Temperature Synthesis of Widely Tunable Formamidinium Lead Halide Perovskite Nanocrystals

Minh, Duong Nguyen; Kim, Juwon; Hyon, Jinho; Sim, Jae Hyun; Sowlih, Haneen H.; Seo, Changwoo; Nam, Jihye; Eom, Sangwon; Suk, Soyeon; Lee, Sangheon; Kim, Eun-Joo; Kang, Youngjong

doi:10.1021/acs.chemmater.7b01705

Cited by 123 publications

(110 citation statements)

References 52 publications

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“…Finally, the composite films were irradiated one more time with UV for seconds to complete photopolymerization. X‐ray diffraction (XRD) diffraction patterns of the composite films well consistent with those in our previous report on FAPbBr 3 nanoparticle synthesis (Figure S4, Supporting Information) . The size of FAPbBr 3 nanoparticles in the composite films was dependent on the polymers.…”

Section: Methodssupporting

confidence: 86%

“…Our approach utilizes the in situ synthesis of perovskite nanoparticles in polymer films during the photopolymerization. Previously, we have demonstrated that formamidinium lead halide (FAPbX 3 ) perovskite nanoparticles can be synthesized from the mixture of PbX 2 ‐DMSO and formamidinium halide (FAX) by decreasing solvent power from dimethylformamide (DMF) to toluene at room temperature . The similar solvent power change can be achieved when polar monomers are polymerized.…”

Section: Methodsmentioning

confidence: 99%

“…Briefly, equivalent amount of PbBr 2 ‐DMSO and FABr were dissolved in DMF with a concentration of 0.05 m . The precursor PbBr 2 ‐DMSO was prepared by following our previous report . The PbBr 2 ‐DMSO/FABr solution (0.3 mL) was then mixed with monomers (1 g) containing photoinitiator (4 wt%).…”

Section: Methodsmentioning

confidence: 99%

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Perovskite Nanoparticle Composite Films by Size Exclusion Lithography

et al. 2018

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Perovskite nanoparticle composite films with capability of high-resolution patterning (≥2 µm) and excellent resistance to various aqueous and organic solvents are prepared by in situ photosynthesis of acrylate polymers and formamidinium lead halide (FAPbX ) nanoparticles. Both positive- and negative-tone patterns of FAPbX nanoparticles are created by controlling the size exclusive flow of nanoparticles in polymer networks. The position of nanoparticles is spatially controlled in both lateral and vertical directions. The composite films show high photoluminescence quantum yield (up to 44%) and broad color tunability in visible region (λ = 465-630 nm).

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Section: Methodssupporting

confidence: 86%

Section: Methodsmentioning

confidence: 99%

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Perovskite Nanoparticle Composite Films by Size Exclusion Lithography

et al. 2018

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“…These phenomena are in accordance to previous reports with such asymmetric ligand ratio. [ 32,33 ] Radiative and non‐radiative rates are calculated from PL QY and PL decay time, shown in Table S1, Supporting Information. [ 16 ] All the samples have the similar radiative rate, but along with the ligand amount decrease, non‐radiative rate goes down.…”

Section: Resultsmentioning

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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“…The OM image under a light field is shown in Figure S5 (Supporting Information). The atomic force microscope (AFM) characterization (Figure e) reveals typical thickness of the FAPbBr 3 NP to be ≈12 nm, this is in good consistence with previous reports on FAPbBr 3 NCs (530 nm PL, ≈12 nm in size) …”

Section: Resultsmentioning

confidence: 99%

Room‐Temperature Ion‐Exchange‐Mediated Self‐Assembly toward Formamidinium Perovskite Nanoplates with Finely Tunable, Ultrapure Green Emissions for Achieving Rec. 2020 Displays

Cao

Gao

et al. 2018

Adv Funct Materials

131

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Delicate engineering of chromaticity is required to faithfully reproduce colors in a backlit display, this is extremely difficult for green downconverters because the human eye is highly sensitive to green colors. The central challenge is to achieve finely tunable green emissions in the narrow range of 525-535 nm while keeping the full width at half maximum (FWHM) <25 nm at the same time. Here, a room-temperature ion-exchange-mediated self-assembly strategy for preparing FAPbBr 3 (FA = CH(NH 2 ) 2 + ) nanoplates (NPs) to fulfill this goal is introduced. 2D layered OA 2 PbBr 4 (OA is octadecylamine) NPs are first synthesized by spontaneous reprecipitation, and are then transformed into FAPbBr 3 NPs through a OA + -to-FA + exchange induced self-assembly of HP monolayers. A c-axis contraction in this process makes a relative large thickness variation in OA 2 PbBr 4 NPs, which can be realized by simply varying the precursor concentration, only result in a small thickness change in subsequent FAPbBr 3 NPs, thereby enabling finely tunable emissions in the range of 525-535 nm along with FWHM <25 nm and a quantum yield up to 85%. As a downconverter, the FAPbBr 3 NPs realize an ultrapure green backlight that covers ≈95% Rec. 2020 standard in the CIE 1931 color space.

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Room-Temperature Synthesis of Widely Tunable Formamidinium Lead Halide Perovskite Nanocrystals

Cited by 123 publications

References 52 publications

Perovskite Nanoparticle Composite Films by Size Exclusion Lithography

Perovskite Nanoparticle Composite Films by Size Exclusion Lithography

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

Room‐Temperature Ion‐Exchange‐Mediated Self‐Assembly toward Formamidinium Perovskite Nanoplates with Finely Tunable, Ultrapure Green Emissions for Achieving Rec. 2020 Displays

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