scholarly journals Ligand Assisted Control of Photoluminescence in Organometal Perovskite Nanocrystals

2021 ◽  
Vol 23 (2) ◽  
pp. 89
Author(s):  
K.S. Sekerbayev ◽  
G.K. Mussabek ◽  
Ye. Shabdan ◽  
Ye.T. Taurbayev
Keyword(s):  
Quantum Confinement ◽  
Optical Transmission ◽  
Quantum Confinement Effect ◽  
Transmission Spectra ◽  
Spectroscopy Analysis ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Light Emitting Devices ◽  
Photoluminescence Peak

Organometal perovskite nanocrystals have shown remarkable properties not only in photovoltaics, but also in light-emitting devices. In this work colloidal nanocrystals of organometal perovskite CH3NH3PbBr3 (MAPBr) with effective visible photoluminescence were synthesized by the ligand assisted reprecipitation method. The studies were carried out by photoluminescence spectroscopy and optical transmission spectroscopy. Analysis of the photoluminescence and transmission spectra showed that by changing the concentration of the ligands oleylamine and octylamine, it is possible to control the size of nanocrystals and the photoluminescence wavelength due to the quantum confinement effect. It was shown that the increase in ligands concentration in MAPBr perovskite nanocrystals (NCs) solutions decreases the width of the peak which indicates a better quality of the obtained nanocrystals. An increase in the band gap indicates a decrease in the size of the nanocrystals. Replacing the ligands in the colloidal perovskite NCs solutions leads to shift of the photoluminescence peak from 456 to 535 nm.

scholarly journals Improved Performance of Perovskite Light-Emitting Diodes by Quantum Confinement Effect in Perovskite Nanocrystals

Nanomaterials ◽  
2018 ◽  
Vol 8 (7) ◽  
pp. 459 ◽  
Author(s):  
Lung-Chien Chen ◽  
Zong-Liang Tseng ◽  
Dai-Wei Lin ◽  
Yu-Shiang Lin ◽  
Sheng-Hui Chen
Keyword(s):  
Quantum Confinement ◽  
Light Emitting Diodes ◽  
Quantum Confinement Effect ◽  
Confinement Effect ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Improved Performance

scholarly journals Hollow metal halide perovskite nanocrystals with efficient blue emissions

2020 ◽  
Vol 6 (17) ◽  
pp. eaaz5961 ◽  
Author(s):  
Michael Worku ◽  
Yu Tian ◽  
Chenkun Zhou ◽  
Haoran Lin ◽  
Maya Chaaban ◽  
...  
Keyword(s):  
Quantum Confinement Effect ◽  
Visible Spectrum ◽  
Precursor Solution ◽  
Metal Halide ◽  
Synthetic Control ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Highly Efficient ◽  
Metal Halide Perovskite ◽  
Halide Perovskite

Metal halide perovskite nanocrystals (NCs) have emerged as new-generation light-emitting materials with narrow emissions and high photoluminescence quantum efficiencies (PLQEs). Various types of perovskite NCs, e.g., platelets, wires, and cubes, have been discovered to exhibit tunable emissions across the whole visible spectrum. Despite remarkable advances in the field of perovskite NCs, many nanostructures in inorganic NCs have not yet been realized in metal halide perovskites, and producing highly efficient blue-emitting perovskite NCs remains challenging and of great interest. Here, we report the discovery of highly efficient blue-emitting cesium lead bromide (CsPbBr3) perovskite hollow NCs. By facile solution processing of CsPbBr3 precursor solution containing ethylenediammonium bromide and sodium bromide, in situ formation of hollow CsPbBr3 NCs with controlled particle and pore sizes is realized. Synthetic control of hollow nanostructures with quantum confinement effect results in color tuning of CsPbBr3 NCs from green to blue, with high PLQEs of up to 81%.

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.

Study on the Optical Transmission Properties of One-Dimensional Photonic Crystal of MoS2

2014 ◽  
Vol 1056 ◽  
pp. 42-46 ◽  
Author(s):  
Kai Wu ◽  
Wei Xia Gu ◽  
Chen Wu ◽  
Jin Lou Ma ◽  
Xi Ying Ma
Keyword(s):  
Photonic Crystal ◽  
Dielectric Layer ◽  
Optical Transmission ◽  
Band Gaps ◽  
Light Emitting ◽  
One Dimensional ◽  
Light Emitting Devices ◽  
Light Transfer ◽  
Transfer Properties ◽  
Photonic Band

We designed MoS2/SiO2one-dimensional (1D) photonic crystal using the concept of photonic crystal and investigated the light transfer properties by means of transfer-matrix method. We found that the transfer properties of photonic crystal can be modified by the period of photonic crystal, the thickness of dielectric layer, and the number of the defect layers. The number of photonic band gaps (PBGs) reduces with the decrease of the thickness of dielectric layer, and the position of PBGs in the spectra rapidly moves to short wavelength direction. For defect photonic crystal, the width of the PBGs obviously become larger, and the transmittance spectra oscillate more intensely, similar to the characteristics of Bragg gratings. These properties will give good instructor for the preparation of 1D MoS2quantum well light emitting devices and solar cells.

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

Low-Dimensional Phase Suppression and Defect Passivation of Quasi-2D Perovskites for Efficient Electroluminescence and Low-Threshold Amplified Spontaneous Emission

Nanoscale ◽  
2021 ◽  
Author(s):  
Guangrong Jin ◽  
Tanghao Liu ◽  
Yuanzhao Li ◽  
Jiadong Zhou ◽  
Dengliang Zhang ◽  
...  
Keyword(s):  
Binding Energy ◽  
Spontaneous Emission ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Light Emitting ◽  
Large Exciton Binding Energy ◽  
Defect Passivation ◽  
Low Threshold ◽  
Halide Perovskites ◽  
Low Dimensional

Quasi-2D metal halide perovskites are promising candidates for light-emitting application owing to their large exciton binding energy and strong quantum confinement effect. Usually, quasi-2D perovskites are composed of multiple phases...

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

Erbium Doped Silicon for Light Emitting Devices

1996 ◽  
Vol 422 ◽  
Author(s):  
J. Michel ◽  
B. Zheng ◽  
J. Palm ◽  
E. Ouellette ◽  
F. Gan ◽  
...  
Keyword(s):  
System Performance ◽  
Optical Transmission ◽  
Cmos Technology ◽  
Transmission System ◽  
Auger Process ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Erbium Doped ◽  
Doped Silicon ◽  
Excitation Processes

AbstractWe report on the excitation and de-excitation processes of erbium implanted in silicon and the integration of Si:Er light emitting devices (LED) with standard CMOS technology. We find two deexcitation processes, an Auger process below 100 K and a phonon mediated energy backtransfer above 100 K. We present the first optical voice link with a silicon LED as the emitter. Optical transmission system performance with our LED is possible below 200 K.

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