scholarly journals Correlation of near-unity quantum yields with photogenerated excitons in X-type ligand passivated CsPbBr3 perovskite quantum dots

2019 ◽  
Vol 1 (8) ◽  
pp. 2828-2834 ◽  
Author(s):  
Sunjoong Park ◽  
Hyunjin Cho ◽  
Wonseok Choi ◽  
Hanfeng Zou ◽  
Duk Young Jeon
Keyword(s):  
Quantum Dots ◽  
Radiative Decay ◽  
Quantum Yields ◽  
Nonradiative Decay ◽  
Perovskite Quantum Dots

The TCSPC analysis revealed that DDT-PQDs mainly performed single radiative decay, whereas PQDs showed additional slow nonradiative decay with rise of temperature.

Promoting photoluminescence quantum yields of glass-stabilized CsPbX3 (X = Cl, Br, I) perovskite quantum dots through fluorine doping

Nanoscale ◽  
2019 ◽  
Vol 11 (37) ◽  
pp. 17216-17221 ◽  
Author(s):  
Daqin Chen ◽  
Yue Liu ◽  
Changbin Yang ◽  
Jiasong Zhong ◽  
Su Zhou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yields ◽  
Fluorine Doping ◽  
Glass Crystallization ◽  
Perovskite Quantum Dots

Highly luminescent glass-stabilized CsPbX3 (X = Cl, Br, I) perovskite QDs are fabricated via an in situ glass crystallization strategy and fluorine doping.

scholarly journals Inverted energy gap law for the nonradiative decay in fluorescent floppy molecules: larger fluorescence quantum yields for smaller energy gaps

2019 ◽  
Vol 6 (12) ◽  
pp. 1948-1954 ◽  
Author(s):  
Junqing Shi ◽  
Maria A. Izquierdo ◽  
Sangyoon Oh ◽  
Soo Young Park ◽  
Begoña Milián-Medina ◽  
...  
Keyword(s):  
Radiative Decay ◽  
Energy Gap ◽  
Quantum Yields ◽  
Nonradiative Decay ◽  
Fluorescence Quantum Yields ◽  
Energy Gaps ◽  
Energy Gap Law ◽  
Solution Increase ◽  
Floppy Molecules ◽  
Franck Condon

The non-radiative decay of substituted dicyano-distyrylbenzenes in solution increase with the Franck–Condon energy, being opposite to the conventional energy gap law.

Room-temperature and gram-scale synthesis of CsPbX3 (X = Cl, Br, I) perovskite nanocrystals with 50–85% photoluminescence quantum yields

2016 ◽  
Vol 52 (45) ◽  
pp. 7265-7268 ◽  
Author(s):  
Song Wei ◽  
Yanchun Yang ◽  
Xiaojiao Kang ◽  
Lan Wang ◽  
Lijian Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Room Temperature ◽  
Quantum Yields ◽  
Perovskite Nanocrystals ◽  
Perovskite Quantum Dots

CsPbX3 perovskite quantum dots with 50–85% photoluminescence quantum yields have been successfully synthesized at room temperature in open air.

scholarly journals Synthetic and Post-Synthetic Strategies to Improve Photoluminescence Quantum Yields in Perovskite Quantum Dots

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 957
Author(s):  
ChaeHyun Lee ◽  
Soo Jeong Lee ◽  
YeJi Shin ◽  
Yeonsu Woo ◽  
Sung-Hwan Han ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Raw Materials ◽  
Photophysical Properties ◽  
Optoelectronic Devices ◽  
Charge Recombination ◽  
Quantum Yields ◽  
Recrystallization Process ◽  
Recombination Processes ◽  
Perovskite Quantum Dots ◽  
Efficient Charge

Making high-quality raw materials is the key to open the versatile potential of next generation materials. All-inorganic CsPbX3 (X: Cl−, Br−, and/or I−) perovskite quantum dots (PQDs) have been applied in various optoelectronic devices, such as photocatalysis, hydrogen evolution, solar cells, and light-emitting diodes, due to their outstanding photophysical properties, such as high photoluminescence quantum yield (PLQY), absorption cross-section, efficient charge separation, and so on. Specifically, for further improvement of the PLQY of the PQDs, it is essential to diminish the non-radiative charge recombination processes. In this work, we approached two ways to control the non-radiative charge recombination processes through synthetic and post-synthetic processes. Firstly, we proposed how refinement of the conventional recrystallization process for PbI2 contributes to higher PLQY of the PQDs. Secondly, after halide exchange from CsPbI3 PQDs to CsPbBr3, through an in situ spectroelectrochemical setup, we monitored the positive correlation between bromide deposition of on the surface of the perovskite and photoluminescence improvement of the CsPbBr3 perovskite film through electrodeposition. These two strategies could provide a way to enhance the photophysical properties of the perovskites for application to various perovskite-based optoelectronic devices.

Stable CsPbBr3 perovskite quantum dots with high fluorescence quantum yields

2018 ◽  
Vol 42 (12) ◽  
pp. 9496-9500 ◽  
Author(s):  
Min Zhang ◽  
Zhi-Quan Tian ◽  
Dong-Liang Zhu ◽  
He He ◽  
San-Wei Guo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yields ◽  
Fluorescence Quantum Yields ◽  
Perovskite Quantum Dots ◽  
High Fluorescence ◽  
The Stability

After replacing oleylamine with (3-aminopropyl)triethoxysilane, the stability of the as-prepared CsPbBr3 QDs was significantly improved.

Highly emitting perovskite quantum dots are finally available in water

2018 ◽  
Vol 9 (01) ◽  
pp. 1-2 ◽  
Author(s):  
Guocan Jiang ◽  
Nikolai Gaponik
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Scale Up ◽  
Quantum Yields ◽  
Aqueous Environment ◽  
Aqueous Synthesis ◽  
Perovskite Nanocrystals ◽  
Perovskite Quantum Dots ◽  
Perovskite Nanoparticles

The interest on strongly emitting colloidal perovskite nanoparticles has been arisen explosively since several years. The versatility of the synthesis and the resulting scale-up, as well as high performance in terms of photoluminescence quantum yields and narrow spectra make these nanocrystals extremely attractive in optoelectronics. However, commonly known instability of these nanoparticles in aqueous environment is an important issue limiting their applications. This letter highlights a recent report by Geng et al. presenting direct aqueous synthesis of strongly emitting perovskite nanocrystals. One can foresee extrapolation of these results toward other perovskites including those based on Pb-free materials.

Lead-free silver-antimony halide double perovskite quantum dots with superior blue photoluminescence

2019 ◽  
Vol 55 (98) ◽  
pp. 14741-14744 ◽  
Author(s):  
Kexin Lv ◽  
Shaopeng Qi ◽  
Guoning Liu ◽  
Yongbing Lou ◽  
Jinxi Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Blue Emission ◽  
Double Perovskite ◽  
Lead Free ◽  
Quantum Yields ◽  
Perovskite Quantum Dots ◽  
Surfactant Assisted ◽  
Blue Photoluminescence

Sb-based lead-free double perovskite Cs2AgSbX6 (X = Cl, Br or I) quantum dots exhibiting excellent air stability and blue emission with photoluminescence quantum yields of 31.33% were synthesized firstly using surfactant-assisted method.

scholarly journals Enhanced Air Stability of Perovskite Quantum Dots by Manganese Passivation

Technologies ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 10
Author(s):  
Ryota Sato ◽  
Kazuki Umemoto ◽  
Satoshi Asakura ◽  
Akito Masuhara
Keyword(s):  
Quantum Dots ◽  
Thermal Conditions ◽  
The Other ◽  
Quantum Yields ◽  
Full Width ◽  
Half Maximum ◽  
Air Humidity ◽  
Passivating Layer ◽  
Perovskite Quantum Dots ◽  
Color Tunability

Organic-inorganic perovskite quantum dots (PeQDs) have attracted attention due to their excellent optical properties, e.g., high photoluminescence quantum yields (PLQYs; >70%), a narrow full width at half maximum (FWHM; 25 nm or less), and color tunability adjusted by the halide components in an entire tunability (from 450 nm to 730 nm). On the other hand, PeQD stability against air, humidity, and thermal conditions has still not been enough, which disturbs their application. To overcome these issues, with just a focus on the air stability, Mn2+ ion passivated perovskite quantum dots (Mn/MAPbBr3 QDs) were prepared. Mn2+ could be expected to contract the passivating layer against the air condition because the Mn2+ ion was changed to the oxidized Mn on PeQDs under the air conditions. In this research, Mn/MAPbBr3 QDs were successfully prepared by ligand-assisted reprecipitation (LARP) methods. Surprisingly, Mn/MAPbBr3 QD films showed more than double PLQY stability over 4 months compared with pure MAPbBr3 ones against the air, which suggested that oxidized Mn worked as a passivating layer. Improving the PeQD stability is significantly critical for their application.

Strong violet emission from ultra-stable strontium-doped CsPbCl3 superlattices

Nanoscale ◽  
2022 ◽  
Author(s):  
Yongqiang Ji ◽  
Minqiang Wang ◽  
Zhi Yang ◽  
Hao Wang ◽  
Muhammad Amin Padhiar ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yields ◽  
Violet Emission ◽  
Perovskite Quantum Dots ◽  
Halide Perovskites ◽  
Stable Strontium ◽  
Lead Halide

Among the lead halide perovskites, photoluminescence quantum yields (PLQYs) of perovskite quantum dots (PQDs) in the violet are very lowest. This is an obstacle to the optical application of the...

Formation of highly luminescent cesium bismuth halide perovskite quantum dots tuned by anion exchange

2018 ◽  
Vol 54 (30) ◽  
pp. 3779-3782 ◽  
Author(s):  
Yongbing Lou ◽  
Mengying Fang ◽  
Jinxi Chen ◽  
Yixin Zhao
Keyword(s):  
Thermal Stability ◽  
Quantum Dots ◽  
Exchange Reaction ◽  
Anion Exchange ◽  
Wavelength Range ◽  
Quantum Yields ◽  
Excellent Thermal Stability ◽  
Perovskite Quantum Dots ◽  
Halide Perovskite ◽  
Anion Exchange Reaction

Cs3Bi2Br9 quantum dots, with excellent thermal stability and photoluminescence quantum yields of up to 22%, have been prepared. A PL wavelength range from 380 to 526 nm could be achieved through a fast reversible anion exchange reaction.

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