Nanoscale
·
2019
·Vol. 12
·期 4
·2569-2577
·
IF 6.97
Aijing Gao,Jia Yan,Zhaojin Wang,Pai Liu,Dan Wu,Xiaobing Tang,Fan Fang,Shihao Ding,Xiang Li,Jiayun Sun,Meijuan Cao,Liduo Wang,Luhai Li,Kai Wang,Xiao Wei Sun
Printable perovskite quantum dot (QD) ink is very important for achieving high quality coffee ring-free fluorescent microarrays for different kinds of emerging perovskite optoelectronic applications using inkjet printing. In this work, we prepared a printable CsPbBr3 perovskite QD ink by mixing high-boiling point dodecane with low-boiling point toluene as a solvent. The evaporation rate, viscosity and surface tension of the ink were carefully optimized by tuning the volume ratio of these two solvents for forming appropriate Marangoni flow, so as to balance the capillary flow and eliminate the coffee ring effect further. Successfully, CsPbBr3 perovskite microarrays with uniform surface, low roughness and no coffee rings were achieved by inkjet printing the optimized perovskite QD ink on a PVK (poly-(9-vinylcarbazole)) layer. Furthermore, we patterned the CsPbBr3 perovskite QD ink, and the printed patterns were only visible under ultraviolet (UV) light, which can be applied in invisible anti-counterfeiting labels and encryption in the future.
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Journal of Physical Chemistry C
·
2020
·
IF 4.189
Keisei Shibata,Jiyu Yan,Yuji Hazama,Shaoqiang Chen,Hidefumi Akiyama
This is the first study of lead halide perovskites (LHPs) that compares the coupling strengths between longitudinal optical (LO) phonons and free or localized excitons. In this research, we measured the excitation density and temperature dependence of the photoluminescence (PL) spectra in the range of 4-300 K in a CsPbBr3 single crystal. The PL peak energy of the free excitons monotonically blueshifts when the temperature increases, and so does the localized excitons until the temperature reaches 80 K. Above 80 K, however, the PL peak energy of the localized excitons redshifts when the temperature increases. We analyzed this unique temperature dependence using the configuration coordinate model, focusing on the exciton - LO phonon interaction. We showed that this unique temperature dependence can be exhibited as the localized excitons couple with the LO phonons with enhanced strength and have larger relaxation energy than the free excitons.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Shuai Liu,Ke Zhang,Lu Tan,Shaopeng Qi,Guoning Liu,Jinxi Chen,Yongbing Lou
All-inorganic halide perovskites have recently made remarkable achievements in the field of photo-electrochemistry, but rarely been applied in energy storage devices, especially, in lithium-ion batteries (LIBs). In this article, the specific composite composed of carbon nanotubes (CNTs) tightly wrapped perovskite-CsPbBr 3 (CsPbBr 3 @CNTs) was synthesized by a simplified co-precipitation method. Attributed to the specific morphology, the CsPbBr 3 @CNTs composite supplied short pathways for the transport of both electrons and lithium ions, along with the interface for pseudocapacitive behavior. The synergistic effects of CsPbBr 3 and CNTs enhanced the pseudocapacitive effect, thus, CsPbBr 3 @CNTs exhibited high cycling stability and rate capability. The prominent lithium storage capabilities were exhibited then, with first reversible capacity of 644.6 mA h g −1 /100 mA g −1 and maintained at 470.2 mA h g −1 after 200 cycles. Moreover, under the large current density of 600 mA g −1 , it kept a stable capacity of 203.8 mA h g −1 . This study, for the very first time, proved the great application potential of all-inorganic perovskite composite materials with surface dominating pseudocapacitive contribution in LIBs.
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Enyang Liu,Lei Lei,Bingxin Xie,Shiqing Xu
Cesium lead halide (CsPbX 3 X = I, Br, Cl) perovskites have potential applications in the fields of X-ray fluorescence imaging, solar cells, light-emitting diodes (LEDs) and photocatalysis due to their excellent optical and electrical properties. In this work, we propose a novel method to tune the emission color of CsPbBr 3 by polar solvent post-treatment. The blue emission color of the two-dimensional (2D) CsPbBr 3 nanoplatelets (NPLs) prepared at room temperature is evidently changed to green under UV excitation via DMF post-treatment. We verify the DMF is used to decompose these NPLs into 0D quantum dots followed by the color variation. We further reveals the polarity of the employed solvent is the main parameter in the decomposition processes. This novel route might be suitable for other 2D perovskites and benefit the application of these colorful products in LEDs and information storage fields.
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Yusheng Song,Xi Yuan,Ke Xing,Sheng Cao,Jinju Zheng,Bingsuo Zou,Jialong Zhao
Improving the photoluminescence quantum yields (PL QYs) and stability of blue-emitting CsPbBr 3 nanoplatelets (NPLs) is essential for the application in high-quality displays. Herein, highly luminescent CsPbBr 3 NPLs with PL peak at 462 nm were prepared by a modified supersaturated recrystallization synthesis strategy at room temperature. The resulting blue CsPbBr 3 NPLs show high PL QY of 98% and a full width at half maximum of 13 nm, benefiting from the decyl disulfide (DF) surface treatment. Besides, the DF-treated CsPbBr 3 NPLs show lower Urbach energy (15 meV) and more outstanding water, acetone, and UV-light resistance stabilities than the pristine ones, suggesting that the surface ligand treatment can reduce Br − vacancy defects and inhibit the non-radiative recombination process. Based on the temperature-dependent PL, the exciton binding energy of CsPbBr 3 NPLs is found to increase from 109 to 201 meV after DF treatment. Finally, light-emitting diodes based on the treated CsPbBr 3 NPLs were fabricated.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 31
·1-11
·
IF 2.8
Xiang Zhiwei,Mei Xiang,Yan Junjie,Mo Dingdiao,Fu Weihai,Jin Peixuan,Yang Yuanzheng,Cai Weitong
CsPbBr 3 perovskite solar cells have garnered significant attention owing to their exceptional stability and facile fabrication in ambient conditions. Nonetheless, producing high-quality CsPbBr 3 thin films presents formidable challenges due to the intricate process and the employment of hazardous solvents. In this study, we propose a sustainable binary solvent system comprising water and absolute ethyl alcohol (EtOH) as a non-toxic substitute for the conventional toxic methanol employed as a CsBr solvent. Through modulation of the EtOH volume ratio in the binary solvent and implementation of a three-step spin-coating technique, defect-free, uniformly smooth, and exceptionally crystalline CsPbBr 3 thin films were effectively produced. The fabricated CsPbBr 3 thin films were employed in the construction of CsPbBr 3 perovskite solar cells. Experimental outcomes revealed that the CsPbBr 3 perovskite solar cells fabricated in the binary solvent system, with an EtOH volume ratio of 60%, attained an optimal photovoltaic conversion efficiency of 7.02%. Additionally, the architecture of the perovskite solar cells comprises FTO/c-TiO 2 /m-TiO 2 /CsPbBr 3 /carbon. Significantly, the device demonstrated exceptional humidity stability under ambient conditions, preserving 92% of its initial efficiency even after 30 days of testing. This study not only presents a straightforward approach for fabricating phase-pure CsPbBr 3 thin films but also contributes to the mitigation of toxic solvent usage during the fabrication of CsPbBr 3 perovskite solar cells.
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LANGMUIR
·
2020
·
IF 3.557
Siyu Guo,Hu Liu,Haiyang He,Wei Wang,Lin Jiang,Xuhui Xiong,Li Wang
Long-chain zwitterionic ligands have been demonstrated to greatly improve the chemical durability of colloidal CsPbBr3 nanocrystals (NCs) by the chelate effect. However, Br sources are toxic, and the reaction is so dynamic that it is hard to control the size of the crystal. We propose an eco-friendly strategy to improve the chemical durability of colloidal CsPbBr3 NCs. Nontoxic, inexpensive, and directly available benzoyl bromine was used as the Br source, and tri-n-octylphosphine oxide was used as the adjuvant to control the reaction kinetics. Uniform, monodispersed NCs with a size of ∼11 nm were obtained. They had high photoluminescence quantum yields (PLQYs) of above 95% and, especially, showed strong stability against attack by polar solvents. The PLQY remained 80% even after 12 cycles of purification. Furthermore, after 24 h of continuous radiation by 405 nm laser, the photoluminescence (PL) intensity showed negligible decrease, and the wavelength and full width at half-maximum of PL had no significant change.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chenxu Wang,Lihe Yan,Jinhai Si,Tianyu Huo,Xun Hou
All-inorganic lead halide perovskites nanocrystals (NCs) have been demonstrated to be promising candidates for optoelectronic devices, but preparing perovskite NCs with high photoluminescence quantum yields (PLQYs) and excellent stability has been a challenge. In this work, CsPbBr 3 /Cs 4 PbBr 6 core/shell NCs with a PLQYs of 87.23% and long-term stability in ambient environments was prepared by room temperature inverse microemulsion method. The excellent stability of the sample was attributed to the protection of Cs 4 PbBr 6 , and higher PLQYs could be owing to the passivation effect of the core/shell structure. To illustrate the distribution of photogenerated carrier in the core/shell structure, a confined excitons model was proposed based on time-resolved PL and temperature dependent PL measurements. Femtosecond time-resolved transient absorption spectra measurements were performed upon different excitation wavelength to unveil the photogenerated carrier dynamics in core/shell NCs. Upon 300 nm excitation, a carrier transfer process with the time of 3.18 ps from shell to core layer was observed. Furthermore, both two- and three-photon absorption PL was discovered in core/shell NCs, further verifying the carrier transfer process.
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OPTIK
·
2021
·
IF 2.443
Pan Lu,Lin Lin,Zheng Li,Zhuohong Feng,Yuanming Yang,Jieyi Cai,Zhezhe Wang,Zhiqiang Zheng
Dual-phase compounds consisting of CsPbBr 3 perovskite quantum dots (PQDs) and NaYF 4 :Ho 3+ nanoparticles (NPs) were prepared, and their phase compositions and luminescence properties were characterized. The temperature-dependent fluorescence spectra of compounds were measured under 447 nm excitation in the temperature range from 123 K to 433 K. With the increase of temperature, the fluorescence intensities of PQDs and NPs show different decreasing trends due to different temperature quenching mechanisms. Then, the temperature sensing properties of compounds are studied via fluorescence intensity ratios (FIRs) of 529 nm (CsPbBr 3 ) to 647 nm and 751 nm (NaYF 4 :Ho 3+ ). The result shows that I 529 /I 751 owns super large absolute sensitivity (385 K −1 ), high relative sensitivity (5.13%∙K −1 ) and distinct optimum temperature uncertainty (0.00345 K). Therefore, this compound may be used as highly sensitive temperature sensors .
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JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Yuechan Li,Xiaolu Yang,An Xie
Lead halide perovskite CsPbBr 3 nanocrystals (NCs) have attracted great interest in recent years owing to their excellent properties such as strong light absorption , high photoluminescence quantum yield (PLQY), good wavelength tunability, and narrow FWHM. However, their instability is still a bottleneck for their potential application. In this work, a pseudo-peritectic method, which is a peritectic reaction in solutions, was proposed. The phenomenon of “Survival of the fittest” was observed. The synthesized CsPb 2 Br 5 phase greatly reduces the surface defects , and improves the stability and PL properties. The pseudo-peritectic method using for preparing surface modified CsPbBr 3 @CsPb 2 Br 5 nanocrystals is a significant pathway to achieve long-term stable lead halide perovskite for optoelectronic devices .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Ying Liu,Bingfeng Shi,Qian Liu,Changli Lü
All-inorganic perovskite quantum dots (PQDs) have received great attention in the field of optoelectronics because of their excellent optical properties . However, the application of perovskite is always limited because of its poor stability. Herein, the CsPbBr 3 PQDs were stabilized by two-dimensional (2D) nanosheets of layered double hydroxide (LDH) for the first time using a simple one-pot in-situ growth route. In the as-synthesized LDH/CsPbBr 3 nanocomposite, CsPbBr 3 PQDs are uniformly attached to the surface of the LDH nanosheets . The resulted composite powder showed good green-luminescence, high solid PLQY (∼41%), narrower FWHM (∼20.0 nm), long fluorescence lifetime, excellent humidity stability and photostability. The unique 2D structured LDH nanosheets imparts significantly enhanced stability to LDH/CsPbBr 3 composite. All these advantageous properties make the LDH-based fluorescent composite good candidate for flat-panel displays and lighting devices. Our research proposes a novel method to stabilize PQDs by using inorganic 2D nanosheet materials and provides new opportunities for the applications of perovskite in optoelectronic field such as white light-emitting diode (LED).
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Materials
·
2019
·Vol. 12
·期 8
·1215
·
IF 2.972
Xu Zhang,Qing Li,Shikai Yan,Wei Lei,Jing Chen,Khan Qasim
Taking advantage of a large light absorption coefficient, long charge carrier diffusion length and low-cost solution processing, all-inorganic halides perovskite CsPbBr3quantum dots (QDs) are combined with a ZnO QD film to construct a high-performance photodetector. In this work, a novel photodetector device based on transistor structure with dual active layers composed of CsPbBr3and ZnO film is proposed. In this structure, CsPbBr3film functions as the light-absorbing layer and ZnO film acts as the conducting layer. Owing to the high electron mobility and hole-blocking nature of the ZnO QDs film, the photo-induced electron-hole pairs can be separated efficiently. As a result, the device exhibits high performance with response of 43.5 A/W, high detection up to 5.02 × 1011Jones and on/off ratio of 5.6 × 104under 365 nm light illumination. Compared with the ZnO-only phototransistor (the photodetector with the structure of transistor) the performance of the CsPbBr3phototransistor showed significant improvement, which is superior to the majority of photodetectors prepared by perovskite. This work demonstrates that the ZnO QDs film can be applied in the photodetector device as a functional conducting layer, and we believe that the hybrid CsPbBr3/ZnO phototransistor would promote the development of low-cost and high-performance photodetectors.
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