Role of Cation-Anion Organic Ligands for Optical Properties of Fully Inorganic Perovskite Quantum Dots

MRS Advances ◽  
2018 ◽  
Vol 3 (55) ◽  
pp. 3255-3261 ◽  
Author(s):  
Aaron Forde ◽  
Talgat Inerbaev ◽  
Dmitri Kilin
Keyword(s):  
Quantum Dots ◽  
Surface Passivation ◽  
Binding Energies ◽  
Organic Ligands ◽  
Trap States ◽  
Light Emitting ◽  
Inorganic Perovskite ◽  
Perovskite Quantum Dots ◽  
Reasonable Choice

ABSTRACTApplication of lead-halide perovskite nanostructures for photovoltaic and light emitting applications depends on fashion of the surface termination. The reasonable choice of surface ligands for perovskite nanostructures prevent formation of trap states and contribute to chemical stability, wide opening of the bandgap, and intensity of absorption and photoluminescence of perovskite nanostructures. This work provides atomistic arguments for dual ligand protocol of surface passivation of fully inorganic perovskite quantum dots with fully organic ligands being a mix of cations (ethyl-ammonium) and anions (acetic) in nearly equal proportions. Computed binding energies of either individual ligands or anion-cation pairs demonstrate high stability in comparison to thermal energy and are concluded to be favourable choice in synthesis of colloidal perovskite quantum dots for light emitting applications.

Enhancing the light-emitting performance and stability in CsPbBr3 perovskite quantum dots via simultaneous doping and surface passivation

2020 ◽  
Vol 8 (41) ◽  
pp. 14439-14445 ◽  
Author(s):  
Hengxiang Yang ◽  
Wenxu Yin ◽  
Wei Dong ◽  
Long Gao ◽  
Ching-Hong Tan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Passivation ◽  
Color Purity ◽  
Promising Candidate ◽  
Light Emitting ◽  
Inorganic Perovskite ◽  
Perovskite Quantum Dots ◽  
Optoelectronic Applications ◽  
Simultaneous Doping ◽  
Narrow Emission

Inorganic perovskite CsPbBr3 quantum dots (QDs) have emerged as a promising candidate for optoelectronic applications due to their narrow emission and color purity, among other things.

All-Inorganic Perovskite Quantum Dots/p-Si Heterojunction Light-Emitting Diodes under DC and AC Driving Modes

2017 ◽  
Vol 6 (2) ◽  
pp. 1700897 ◽  
Author(s):  
Jingjing Liu ◽  
Xuexi Sheng ◽  
Yangqing Wu ◽  
Dongke Li ◽  
Jianchun Bao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Inorganic Perovskite ◽  
Perovskite Quantum Dots

The Enhancement of Band Edge Emission from ZnS/Zn(OH)2 Quantum Dots

2000 ◽  
Vol 642 ◽  
Author(s):  
Hatim Mohamed El-Khair ◽  
Ling Xu ◽  
Xinfan Huang ◽  
Minghai Li ◽  
Xiaofeng Gu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Surface Passivation ◽  
Band Edge ◽  
Band Edge Emission ◽  
Trap States ◽  
Edge Emission ◽  
Surface Trap ◽  
Quantum Size ◽  
Transmission Electron

ABSTRACTWurtzite structure monodisperse ZnS quantum dots (QDs) of 1 to 5 nm diameter, synthesized by colloidal chemical method, were confirmed by transmission electron microscopy (TEM) images and electron diffraction (ED) patterns. Enhanced blue shifted band edge emission from Zn(OH)2 capped ZnS QDs with decreasing size has been observed, which indicates the role of inorganic surface passivation and hence supports the quantum size effect. Detectable far-red shifted emission from bare ZnS QDs has been observed when QDs precursors and stabilizer dispersed in solvents with different polarities. This emission is attributed to the surface trap states of different energies.

Water-stable and ion exchange-free inorganic perovskite quantum dots encapsulated in solid paraffin and their application in light emitting diodes

Nanoscale ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 5557-5563 ◽  
Author(s):  
Haishan Wu ◽  
Shan Lin ◽  
Ruina Wang ◽  
Xu You ◽  
Yuwu Chi
Keyword(s):  
Quantum Dots ◽  
Ion Exchange ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Inorganic Perovskite ◽  
Solid Paraffin ◽  
Perovskite Quantum Dots ◽  
Promising Application

Perovskite quantum dots encapsulated in solid paraffin (P-PQDs) are water-stable and ion exchange-free, and show promising application in LEDs.

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