Highly Luminescent and Ultrastable CsPbBr<sub>3</sub> Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith

Li, Zhichun; Kong, Long; Huang, Shouqiang; Li, Liang

doi:10.1002/anie.201703264

Cited by 384 publications

(308 citation statements)

References 43 publications

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“…[18,19] Under 27 °C and 60% humidity, we studied the photostability of ZJU-28⊃MAPbBr 3 single crystals and MAPbBr 3 -NCs (dispersed in toluene, for the comparison). [18,19] Under 27 °C and 60% humidity, we studied the photostability of ZJU-28⊃MAPbBr 3 single crystals and MAPbBr 3 -NCs (dispersed in toluene, for the comparison).…”

Section: Multiphoton Excitationmentioning

confidence: 99%

Confinement of Perovskite‐QDs within a Single MOF Crystal for Significantly Enhanced Multiphoton Excited Luminescence

et al. 2018

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and then generate a high-energy photon through radiation transitions from the excited state. Compared with single photon excited luminescence, MPE luminescence has the advantages of stronger spatial confinement, longer penetration depth, smaller biological damage, and less Rayleigh scattering, so the high-order MPE luminescence materials have great potential applications in bioimaging, 3D optical data storage, sensing, and so on, but basically have not been fulfilled yet, [1][2][3][4][5] mainly because of the big challenge and difficulty to realize high-order MPE luminescence. Even for those materials exhibiting such MPE luminescence, the five-photon excited luminescence phenomena can be only observed in the dispersed solutions of either organic chromophore molecules or core-shell halide perovskite semiconductor nanocrystals (MAPbBr 3 /(OA) 2 PbBr 4 ) in order to diminish the aggregation-caused quenching (ACQ) while still with quite low multiphoton action cross-sections (MPACs), or have poor stability without any encapsulation approaches (The MPAC (ησ n ) is the product of photoluminescence quantum yield (PLQY, η) and multiphoton absorption cross-section (σ n ), the parameter to evaluate the multiphoton excited luminescence brightness). [6,7] The deficiency of bulky high-order MPE luminescence solid single crystals with low excitation threshold have further limited the exploration and implementation of such MPE materials into miniaturization and device, and thus their practical applications.Some porous materials such as mesoporous silica and porous alumina have been utilized to confine dye molecules and perovskite nanoparticles and thus to diminish the ACQ and to develop the solid-state luminescence. [4,[8][9][10][11] The emergence of a new type of porous materials, metal-organic frameworks (MOFs), has provided the significant promise to provide much better confinement for the potentially luminescent dye molecules and perovskite nanoparticles because of their more tunable pores/cages and specific sites to introduce strong recognitions. Indeed, we have recently realized a three-photon excited emissive material ZJU-68⊃DMASM through an exact match of a dye molecule with the pores of the metal-organic framework although high-order MPE luminescence solid single The development of the photostable higher-order multiphoton-excited (MPE) upconversion single microcrystalline material is fundamentally and technologically important, but very challenging. Here, up to five-photon excited luminescence in a host-guest metal-organic framework (MOF) and perovskite quantum dot (QD) hybrid single crystal ZJU-28⊃MAPbBr 3 is shown via an in situ growth approach. Such a MOF strategy not only results in a high QD loading concentration, but also significantly diminishes the aggregationcaused quenching (ACQ) effect, provides effective surface passivation, and greatly reduces the contact of the QDs with the external bad atmosphere due to the confinement effect and protection of the framework. These advantages make the resulting ZJU-28⊃MAPb...

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Section: Multiphoton Excitationmentioning

confidence: 99%

Confinement of Perovskite‐QDs within a Single MOF Crystal for Significantly Enhanced Multiphoton Excited Luminescence

et al. 2018

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“…It can be seen from the spectrum of the resulting device (Figure 4a), three discrete emission peaks located at 442, 520, and 621 nm were observed. And the as-prepared composites [28,36,37,40,42,46,47,51,53] could act as the green phosphors with decent performance. The selected triangle of blue, green, and red monochromatic light covers 130% of the National Television System Committee (NTSC) standard, which indicates great potential application in white backlights for LCDs.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

“…[43] And inorganic materials such as TiO 2 , [44] Al 2 O 3 , [45][46][47] SiO 2 , [48][49][50][51][52] and zeolite [53] were widely used to stabilize the PQDs. [43] And inorganic materials such as TiO 2 , [44] Al 2 O 3 , [45][46][47] SiO 2 , [48][49][50][51][52] and zeolite [53] were widely used to stabilize the PQDs.…”

Section: Introductionmentioning

confidence: 99%

Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF₂ Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes

Wei

Xiao

Xie

et al. 2018

Advanced Optical Materials

118

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Lead halide perovskite quantum dots (PQDs) have been widely recognized as highly luminescent materials for efficient optoelectronic applications owing to their fascinating electronic and optical properties. In spite of the excellent performances for the fabrication of lighting devices, the poor chemical instability greatly hampers their practical applications. The inevitable ion exchange and degradation driven from light, moisture, heat, and others limits their applications such as solid‐state light‐emitting diodes (LEDs). In this paper, the stability of PQDs is improved by integrating them in CaF2 hierarchical nanospheres (HNSs). In comparison with the pristine perovskite materials, the outstanding optical performances are well preserved. The perovskite displays a unique quantum confinement effect in the HNSs. Additionally, embedding the quantum dots in robust CaF2 matrices protects them from being damaged by moisture or light irradiation as well as anion exchange. Furthermore, white LED devices are obtained by mixing green CaF2‐CsPbBr3 composites and commercial red phosphors on a blue chip. The optimized devices show a high luminous efficacy of 62.7 lm W–1 under 20 mA current and preserve the value of 56.3 lm W–1 after working for 8 h.

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“…Except these above materials, encapsulating QDs with silica shell has been recognized as one fantastic approach to improve the stability for perovskite QDs, because silica as an optical transparent, chemical inert, and nontoxic material can prevent the core materials from the release of toxic ion as well as chemical degradation. Actually, coating perovskite QDs with silica has been widely investigated . All those silica coating composites not only maintain almost all the properties related with perovskite QDs but also achieve reduced chemical sensitivity and enhanced thermal and photostability.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin, Core–Shell Structured SiO₂ Coated Mn²⁺‐Doped Perovskite Quantum Dots for Bright White Light‐Emitting Diodes

Tang

Chen

Liu

et al. 2019

Small

108

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All‐inorganic semiconductor perovskite quantum dots (QDs) with outstanding optoelectronic properties have already been extensively investigated and implemented in various applications. However, great challenges exist for the fabrication of nanodevices including toxicity, fast anion‐exchange reactions, and unsatisfactory stability. Here, the ultrathin, core–shell structured SiO2 coated Mn2+ doped CsPbX3 (X = Br, Cl) QDs are prepared via one facile reverse microemulsion method at room temperature. By incorporation of a multibranched capping ligand of trioctylphosphine oxide, it is found that the breakage of the CsPbMnX3 core QDs contributed from the hydrolysis of silane could be effectively blocked. The thickness of silica shell can be well‐controlled within 2 nm, which gives the CsPbMnX3@SiO2 QDs a high quantum yield of 50.5% and improves thermostability and water resistance. Moreover, the mixture of CsPbBr3 QDs with green emission and CsPbMnX3@SiO2 QDs with yellow emission presents no ion exchange effect and provides white light emission. As a result, a white light‐emitting diode (LED) is successfully prepared by the combination of a blue on‐chip LED device and the above perovskite mixture. The as‐prepared white LED displays a high luminous efficiency of 68.4 lm W−1 and a high color‐rendering index of Ra = 91, demonstrating their broad future applications in solid‐state lighting fields.

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Highly Luminescent and Ultrastable CsPbBr₃ Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith

Cited by 384 publications

References 43 publications

Confinement of Perovskite‐QDs within a Single MOF Crystal for Significantly Enhanced Multiphoton Excited Luminescence

Confinement of Perovskite‐QDs within a Single MOF Crystal for Significantly Enhanced Multiphoton Excited Luminescence

Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF₂ Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes

Ultrathin, Core–Shell Structured SiO₂ Coated Mn²⁺‐Doped Perovskite Quantum Dots for Bright White Light‐Emitting Diodes

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Highly Luminescent and Ultrastable CsPbBr3 Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith

Cited by 384 publications

References 43 publications

Confinement of Perovskite‐QDs within a Single MOF Crystal for Significantly Enhanced Multiphoton Excited Luminescence

Confinement of Perovskite‐QDs within a Single MOF Crystal for Significantly Enhanced Multiphoton Excited Luminescence

Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF2 Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes

Ultrathin, Core–Shell Structured SiO2 Coated Mn2+‐Doped Perovskite Quantum Dots for Bright White Light‐Emitting Diodes

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Highly Luminescent and Ultrastable CsPbBr₃ Perovskite Quantum Dots Incorporated into a Silica/Alumina Monolith

Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF₂ Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes

Ultrathin, Core–Shell Structured SiO₂ Coated Mn²⁺‐Doped Perovskite Quantum Dots for Bright White Light‐Emitting Diodes