Surface Crystal Growth of Perovskite Nanocrystals via Postsynthetic Lead(II) Bromide Treatment to Increase the Colloidal Stability and Efficiency of Light-Emitting Devices

2020 ◽  
Vol 12 (40) ◽  
pp. 45574-45581
Author(s):  
Takayuki Chiba ◽  
Yoshihito Takahashi ◽  
Jun Sato ◽  
Shota Ishikawa ◽  
Hinako Ebe ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Colloidal Stability ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices ◽  
Surface Crystal

scholarly journals The dark exciton ground state promotes photon-pair emission in individual perovskite nanocrystals

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Philippe Tamarat ◽  
Lei Hou ◽  
Jean-Baptiste Trebbia ◽  
Abhishek Swarnkar ◽  
Louis Biadala ◽  
...  
Keyword(s):  
Near Infrared ◽  
Exciton State ◽  
Lead Iodide ◽  
Electron Hole ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices ◽  
Optical And Electronic Properties ◽  
Wide Range ◽  
Halide Perovskites

AbstractCesium lead halide perovskites exhibit outstanding optical and electronic properties for a wide range of applications in optoelectronics and for light-emitting devices. Yet, the physics of the band-edge exciton, whose recombination is at the origin of the photoluminescence, is not elucidated. Here, we unveil the exciton fine structure of individual cesium lead iodide perovskite nanocrystals and demonstrate that it is governed by the electron-hole exchange interaction and nanocrystal shape anisotropy. The lowest-energy exciton state is a long-lived dark singlet state, which promotes the creation of biexcitons at low temperatures and thus correlated photon pairs. These bright quantum emitters in the near-infrared have a photon statistics that can readily be tuned from bunching to antibunching, using magnetic or thermal coupling between dark and bright exciton sublevels.

Silica coating enhances the stability of inorganic perovskite nanocrystals for efficient and stable down-conversion in white light-emitting devices

Nanoscale ◽  
2018 ◽  
Vol 10 (43) ◽  
pp. 20131-20139 ◽  
Author(s):  
Fei Zhang ◽  
Zhi-Feng Shi ◽  
Zhuang-Zhuang Ma ◽  
Ying Li ◽  
Sen Li ◽  
...  
Keyword(s):  
White Light ◽  
High Performance ◽  
Silica Coating ◽  
White Led ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices ◽  
Improved Stability ◽  
The Stability ◽  
Down Conversion

CsPbBr3 QDs/silica composites with substantially improved stability were applied as the color-converting layer for high-performance white LED fabrication.

Fluorescence enhancement of perovskite nanocrystals using photonic crystals

2021 ◽  
Author(s):  
Songyan Yuan ◽  
Xinran Zhang ◽  
Wenjing Cao ◽  
Yuhang Sheng ◽  
Cihui Liu ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Fluorescence Enhancement ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices

Enhancing the fluorescence of perovskite nanocrystals (PNCs) will not only boost the development of perovskite light-emitting devices (LEDs), but also broaden their applications in various photoelectronic areas.

Lead-Free Perovskite Nanocrystals for Light-Emitting Devices

2018 ◽  
Vol 9 (7) ◽  
pp. 1573-1583 ◽  
Author(s):  
Jia Sun ◽  
Jeehye Yang ◽  
Jong Ik Lee ◽  
Jeong Ho Cho ◽  
Moon Sung Kang
Keyword(s):  
Lead Free ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices

Neodymium Chloride-Doped Perovskite Nanocrystals for Efficient Blue Light-Emitting Devices

2020 ◽  
Vol 12 (48) ◽  
pp. 53891-53898
Author(s):  
Takayuki Chiba ◽  
Jun Sato ◽  
Shota Ishikawa ◽  
Yoshihito Takahashi ◽  
Hinako Ebe ◽  
...  
Keyword(s):  
Blue Light ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices ◽  
Neodymium Chloride

scholarly journals Multidimensional coherent spectroscopy reveals triplet state coherences in cesium lead-halide perovskite nanocrystals

2021 ◽  
Vol 7 (1) ◽  
pp. eabb3594
Author(s):  
Albert Liu ◽  
Diogo B. Almeida ◽  
Luiz G. Bonato ◽  
Gabriel Nagamine ◽  
Luiz F. Zagonel ◽  
...  
Keyword(s):  
Fine Structure ◽  
Light Emission ◽  
Perovskite Solar Cells ◽  
Triplet States ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices ◽  
Coherent Spectroscopy ◽  
Halide Perovskite ◽  
Lead Halide

Advances in optoelectronics require materials with novel and engineered characteristics. A class of materials that has garnered tremendous interest is metal-halide perovskites, stimulated by meteoric increases in photovoltaic efficiencies of perovskite solar cells. In addition, recent advances have applied perovskite nanocrystals (NCs) in light-emitting devices. It was found recently that, for cesium lead-halide perovskite NCs, their unusually efficient light emission may be due to a unique excitonic fine structure composed of three bright triplet states that minimally interact with a proximal dark singlet state. To study this fine structure without isolating single NCs, we use multidimensional coherent spectroscopy at cryogenic temperatures to reveal coherences involving triplet states of a CsPbI3 NC ensemble. Picosecond time scale dephasing times are measured for both triplet and inter-triplet coherences, from which we infer a unique exciton fine structure level ordering composed of a dark state energetically positioned within the bright triplet manifold.

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