Pink all-inorganic halide perovskite nanocrystals with adjustable characteristics: Fully reversible cation exchange, improving the stability of dopant emission and light-emitting diode application

2020 ◽  
Vol 818 ◽  
pp. 152913 ◽  
Author(s):  
Louwen Zhang ◽  
Ling Xu ◽  
Meng Zhu ◽  
Chen Li ◽  
Luying Li ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
The Stability

scholarly journals Controllable Synthesis of All Inorganic Lead Halide Perovskite Nanocrystals with Various Appearances in Multiligand Reaction System

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1751 ◽  
Author(s):  
Chen Chen ◽  
Louwen Zhang ◽  
Tielin Shi ◽  
Guanglan Liao ◽  
Zirong Tang
Keyword(s):  
Light Emitting Diode ◽  
Dominant Role ◽  
Photophysical Properties ◽  
Reaction System ◽  
Visible Spectrum ◽  
Peanut Oil ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Lead Halide

All inorganic cesium lead halide (CsPbX3, X = Cl, Br, I) perovskite nanocrystals (PNCs) exhibit promising applications in light-emitting devices due to their excellent photophysical properties. Herein, we developed a low-cost and convenient method for the preparation of CsPbX3 PNCs in a multiligand-assisted reaction system where peanut oil is applied as a ligand source. The mixed-halide PNCs with tunable optical-band gap were prepared by mixing the single-halide perovskite solutions at room temperature. The resulting PNCs had good monodispersity, with dimensions of 8–10 nm, high photoluminescence quantum yield (96.9%), narrow emission widths (15–34 nm), and tunable emission wavelength (408–694 nm), covering the entire visible spectrum. Additionally, various morphologies of PNCs, such as nanospheres, nanocubes, and nanowires, were obtained by controlling reaction temperature and time, and the amount of oleamine with multiple ligands in peanut oil potentially playing a dominant role in the nucleation/growth processes of our PNCs. Finally, the resulting CsPbBr3 PNCs were employed to develop a white light-emitting diode (WLED), demonstrating the potential lighting applications for our method.

scholarly journals The Stability of Metal Halide Perovskite Nanocrystals—A Key Issue for the Application on Quantum-Dot-Based Micro Light-Emitting Diodes Display

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1375 ◽  
Author(s):  
Zhibin Shangguan ◽  
Xi Zheng ◽  
Jing Zhang ◽  
Wansheng Lin ◽  
Weijie Guo ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Low Cost ◽  
Metal Halide ◽  
Water Steam ◽  
Light Emitting ◽  
Full Color ◽  
Metal Halide Perovskite ◽  
Halide Perovskite ◽  
The Stability ◽  
Color Conversion

The metal halide perovskite nanocrystal (MHP-NC), an easy-to-fabricate and low cost fluorescent material, is recognized to be among the promising candidates of the color conversion material in the micro light-emitting diode (micro-LED) display, providing that the stability can be further enhanced. It is found that the water steam, oxygen, thermal radiation and light irradiation—four typical external factors in the ambient environment related to micro-LED display—can gradually alter and destroy the crystal lattice. Despite the similar phenomena of photoluminescence quenching, the respective encroaching processes related to these four factors are found to be different from one another. The encroaching mechanisms are collected and introduced in separate categories with respect to each external factor. Thereafter, a combined effect of these four factors in an environment mimicking real working conditions of micro-LED display are also introduced. Finally, recent progress on the full-color application of MHP-NC is also reviewed in brief.

scholarly journals Near Unity PLQY and High Stability of Barium Thiocyanate Based All-Inorganic Perovskites and Their Applications in White Light-Emitting Diodes

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 209
Author(s):  
Gopi Chandra Adhikari ◽  
Saroj Thapa ◽  
Yang Yue ◽  
Hongyang Zhu ◽  
Peifen Zhu
Keyword(s):  
White Light ◽  
Large Scale ◽  
Light Emitting Diode ◽  
Photophysical Properties ◽  
Environmental Stability ◽  
Color Temperature ◽  
Ambient Atmosphere ◽  
Light Emitting ◽  
Halide Perovskite ◽  
Lead Halide

All-inorganic lead halide perovskite (CsPbX3) nanocrystals (NCs) have emerged as a highly promising new generation of light emitters due to their extraordinary photophysical properties. However, the performance of these semiconducting NCs is undermined due to the inherent toxicity of lead and long-term environmental stability. Here, we report the addition of B-site cation and X-site anion (pseudo-halide) concurrently using Ba(SCN)2 (≤50%) in CsPbX3 NCs to reduce the lead and improve the photophysical properties and stability. The as-grown particles demonstrated an analogous structure with an almost identical lattice constant and a fluctuation of particle size without altering the morphology of particles. Photoluminescence quantum yield is enhanced up to near unity (~98%) by taking advantage of concomitant doping at the B- and X-site of the structure. Benefitted from the defect reductions and stronger bonding interaction between Pb2+ and SCN− ions, Ba(SCN)2-based NCs exhibit improved stability towards air and moisture compared to the host NCs. The doped NCs retain higher PLQY (as high as seven times) compared to the host NCs) when stored in an ambient atmosphere for more than 176 days. A novel 3D-printed multiplex color conversion layer was used to fabricate a white light-emitting diode (LED). The obtained white light shows a correlated color temperature of 6764 K, a color rendering index of 87, and luminous efficacy of radiation of 333 lm/W. In summary, this work proposes a facile route to treat sensitive lead halide perovskite NCs and to fabricate LEDs by using a low-cost large-scale 3-D printing method, which would serve as a foundation for fabricating high-quality optoelectronic devices for near future lighting technologies.

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%.

Engineering Color-Stable Blue Light-Emitting Diodes with Lead Halide Perovskite Nanocrystals

2019 ◽  
Vol 11 (24) ◽  
pp. 21655-21660 ◽  
Author(s):  
Stefan T. Ochsenbein ◽  
Franziska Krieg ◽  
Yevhen Shynkarenko ◽  
Gabriele Rainò ◽  
Maksym V. Kovalenko
Keyword(s):  
Blue Light ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Halide Perovskite ◽  
Lead Halide

scholarly journals Investigating the structure–function relationship in triple cation perovskite nanocrystals for light-emitting diode applications

2020 ◽  
Vol 8 (34) ◽  
pp. 11805-11821 ◽  
Author(s):  
Parth Vashishtha ◽  
Sjoerd A. Veldhuis ◽  
Sai S. H. Dintakurti ◽  
Nicole L. Kelly ◽  
Benjamin E. Griffith ◽  
...  
Keyword(s):  
Structure Function ◽  
High Performance ◽  
Surface Passivation ◽  
Light Emitting Diode ◽  
Environmental Stability ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Structure Function Relationship ◽  
Function Relationship

Novel Cs-containing triple cation perovskite nanocrystals produce high-performance LEDs as a result of improved surface passivation and environmental stability.

Improving the Stability of Metal Halide Perovskite Materials and Light-Emitting Diodes

2018 ◽  
Vol 30 (42) ◽  
pp. 1704587 ◽  
Author(s):  
Himchan Cho ◽  
Young-Hoon Kim ◽  
Christoph Wolf ◽  
Hyeon-Dong Lee ◽  
Tae-Woo Lee
Keyword(s):  
Light Emitting Diodes ◽  
Metal Halide ◽  
Light Emitting ◽  
Perovskite Materials ◽  
Metal Halide Perovskite ◽  
Halide Perovskite ◽  
The Stability
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