JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Ya Chu,Chao Wang,Linlin Ma,Xia Feng,Beibei Wang,Yanqing Wu,Yan Jia,Mingshui Zhang,Yan Sun,Haoyue Zhang,Guangjiu Zhao
In this work, we have first demonstrated that the potassium cation doping effect on photoluminescence (PL) regulation of CH 3 NH 3 PbBr 3 (CH 3 NH 3 + =MA + ) colloidal perovskite quantum dots (QDs) is significantly different from the other alkali cation doping effects. The PL intensity will be generally enhanced with the increase doping amounts of other alkali cations. Herein, we have unveiled that the PL of the potassium-doped perovskite QDs is initially prompted by the potassium ions doping and then inhibited with further growing doping amount of the potassium ions. Furthermore, we have also demonstrated that the PL inhibition phenomenon is ascribed as quick trapping of redundant photogenerated electrons by the trap states after huge amount doping besides defect passivation and octahedral structure distortion induced by the initial doping. At the same time, the specific excited state transient absorption and the lifetime of MA x K 1-x PbBr 3 also confirm that the radiation recombination process is enhanced via defect passivation and lattice distortion, which is induced by moderate potassium cations doping. In addition, the PL of colloidal perovskite quantum dots can be adjusted from orange to cyan within the wavelength range of 300 nm − 600 nm and exhibit better stability.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Ya Chen,Xiaojuan Liang,Jianping Liu,Suqin Chen,Weidong Xiang
All-inorganic CsPbX3 perovskite nanocrystals (PeNCs) are being investigated intensively as a promising optoelectronic material. However, the issues of its intrinsic instability and toxicity restrict their commercial applications. Herein, we proposed a facile method to improve the stability of CsPbX3PeNCs by encapsulating in a superhydrophobic polymer poly(styrene–ethylene–butylene–styrene) (SEBS) matrix. The blue–green–red emission CsPbX3@SEBS (X = Cl/Br, Br, Br/I) composite films exhibit high stability against moisture and are thermally stable. It is worth noticing that the photoluminescent quantum yield (PLQY) of the CsPbBrI2@SEBS composite film can reach 60%. The SEBS polymer matrix not only protects the PeNCs from contact with the ambient surroundings but also inhibits the escape of lead ions. Notably, the CsPbX3@SEBS flexible films were used as color conversion materials to construct a light-emitting diode (LED) device, and the device exhibits a wide color gamut (113% of the National Television System Committee (NTSC)). This work demonstrates the potential of using CsPbX3@SEBS flexible films as highly efficient color conversion materials for white LED and backlight displays.
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ACS Applied Energy Materials
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2021
·
IF 6.024
Qing Tian,Guozhen Ding,Yuting Cai,Zicheng Li,Xueyuan Tang,Rong-Jun Xie,Peng Gao
To pursue practical applications of perovskite solar cells (PSCs), while the power conversion efficiencies (PCEs) are continuously pushed up, defect passivation of the metal halide perovskite layer is considered an efficacious method for improving the efficiency and stability of the devices. Herein, we proposed incorporating iodine-rich CsPbI3 quantum dots (QDs) in the halide perovskite film to improve the photovoltaic performance of PSCs. Using the modified QDs enabled the reduction of the nonradiative recombination centers by passivating iodide vacancies and optimization of the energy alignment near to the perovskite/hole transport material interface. Finally, high-performance planar PSCs with an efficiency exceeding 22% and higher long-term stability (over 91% of its initial PCE after 39 days) were achieved.
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JOURNAL OF NANOBIOTECHNOLOGY
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2021
·Vol. 19
·期 1
·1-14
·
IF 10.435
Liu Qinmin,Liu Lijuan,Mo Chunwei,Zhou Xiao,Chen Dongming,He Yu,He Hailu,Kang Wei,Zhao Yongfeng,Jin Guanqiao
Background Nasopharyngeal carcinoma (NPC) is a type of head and neck malignant tumor with a high incidence in specific regional distribution, and its traditional therapies face some challenges. It has become an urgent need to seek new therapeutic strategies without or with low toxicity and side effects. At present, more and more researchers has been attracting attention by nanotheranostic platform. Therefore, our team synthesized the polyethylene glycol-coated ultrasmall superparamagnetic iron oxide nanoparticles-coupled sialyl Lewis X (USPIO-PEG-sLex) nanotheranostic platform with high temperature pyrolysis.Results The USPIO-PEG-sLex nanoparticles had excellent photothermal conversion property, and the temperature of USPIO-PEG-sLex nanoparticles solution increased with its concentration and power density of near-infrared (NIR) on 808 nm wavelengths. Five USPIO-PEG-sLex nanoparticles with different concentrations of 0 mg/ml, 0.025 mg/ml, 0.05 mg/ml, 0.1 mg/ml and 0.2 mg/ml were prepared. The biological toxicity results showed that the viability of NPC 5-8F cells is related to the concentration of USPIO-PEG-sLex nanoparticles and the culture time (P < 0.001). The results of photothermal therapy (PTT) in vitro indicated that the viability of 5-8F cells decreased significantly with the concentration of USPIO-PEG-sLex nanoparticles increases (P < 0.001), and the viability of NPC 5-8F cells were 91.04% ± 5.20%, 77.83% ± 3.01%, 73.48% ± 5.55%, 59.50% ± 10.98%, 17.11% ± 3.14%, respectively. The USPIO-PEG-sLex nanoparticles could target the tumor area, and reduce the T2* value of tumor tissue. The T2* values of tumor pre- and post-injection were 30.870 ± 5.604 and 18.335 ± 4.351, respectively (P < 0.001). In addition, USPIO-PEG-sLex nanoparticles as a photothermal agent for PTT could effectively inhibit tumor progression. The ratio of volume change between tail vein injection group, control group, nanoparticles without laser irradiation group and blank group after 5 treatments were 3.04 ± 0.57, 5.80 ± 1.06, 8.09 ± 1.96, 7.89 ± 2.20, respectively (P < 0.001).Conclusion sOur synthesized USPIO-PEG-sLex nanotheranostic platform, and it may be become a new strategy for the treatment of NPC.Graphic Abstract
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 27
·8537-8544
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IF 7.393
Zhongyuan Guan,Haihang Ye,Peiwen Lv,Lijin Wang,Jing Zhang,Bin Zou,Aiwei Tang
Multinary Cu-based chalcogenide nanocrystals (NCs) are excellent candidates for optoelectronic applications, but their growth mechanism and its impacts on the NCs’ optical properties remain controversial. Herein, we employed a simple colloidal chemistry method for the growth of multinary Cu-based NCs including ternary Cu–In–S NCs, quaternary Cu–In–Se–S NCs, and five-component Cu–In–Zn–Se–S NCs, to explore their growth mechanism and investigate their optical properties. It is found that the ternary Cu–In–S NCs contain a large number of copper vacancies, which affect the major acceptor level for the exciton recombination. With the high reaction activity of Se, the quaternary Cu–In–Se–S NCs form at low reaction temperature and have a red-shift of the photoluminescence (PL) maximum due to the recombination from the conduction band to the acceptor level. The formation process of five-component Cu–In–Zn–Se–S NCs highly depends on the Zn amount, which shows a competitive relationship between the NCs’ growth and diffusion of Zn, leading to the red- and blue-shift of PL maximum, respectively. Our study provides a clear map for the growth of multinary Cu-based NCs and shows their impacts on optical properties.
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Coatings
·
2021
·Vol. 11
·期 5
·581
·
IF 2.881
Linyuan Lian,Youyou Li,Daoli Zhang,Jianbing Zhang
InP quantum dots (QDs) are promising down-conversion phosphors for white light LEDs. However, the mainstream InP QDs synthesis uses expensive phosphorus source. Here, economic, in situ-generated PH3is used to synthesize InP QDs and a two-step coating of ZnS shells is developed to prepare highly luminescent InP/ZnS/ZnS QDs. The QDs show a photoluminescence quantum yield as high as 78.5%. The emission can be tuned by adjusting the halide precursor and yellow emissive InP/ZnS/ZnS QDs are prepared by judiciously controlling the synthetic conditions. The yellow QDs show suppressed thermal quenching and retain >90% room temperature PL intensity at 150 °C for the growth solution. Additionally, the PL spectrum matches with the eye sensitivity function, resulting in efficient InP QD white light LEDs.Keywords:InP;quantum dots;core/shell;InP/ZnS;thermal quenching
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ACS Omega
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2021
·
IF 3.512
Ze Yuan,Lanlan Yang,Dongni Han,Guorong Sun,Chenyu Zhu,Yao Wang,Qiao Wang,Mikhail Artemyev,Jianguo Tang
High-efficiency photoluminescence quaternary hexagon Zn–Cu–In–S (ZCIS) nanoplatelets (NPls) have been synthesized by a two-step cation exchange method, which starts with the In2S3 NPls followed by the addition of Cu and Zn. It is the first time that In2S3 NPls are used as templates to synthesize ZCIS NPls. In this paper, the reaction temperature of In2S3 is essential for the formation of NPls. The photoluminescence wavelength of NPls can be tuned by adjusting the temperature of Cu addition. To enhance the stability of the resulting NPls and to improve their optical properties, we introduced Zn2+ and obtained ZCIS NPls by cation exchange on the surface. It is worth noting that the obtained ZCIS NPls show a shorter fluorescence lifetime than other ternary copper sulfide-based NPls. This work provides a new way to synthesize high-efficiency, nontoxic, and no byproduct ZCIS NPls.
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高影响因子
Solar RRL
·
2021
·Vol. 5
·期 10
·2100499
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IF 8.582
Weiqiang Miao,Chuanhang Guo,Donghui Li,Teng Li,Pang Wang,Yujie Yang,Dan Liu,Tao Wang
Among the emerging photovoltaic technologies, organic and perovskite quantum dots (PQDs) solar cells have thrived on low-cost processing and extraordinary optoelectronic properties. Herein, CsPbBr 3 PQDs are incorporated into PM6:Y6-BO organic solar cell (OSC) to enhance device efficiency without scarifying the device stability. While the incorporation of PQDs has no impact on the molecular packing and phase separation of organic semiconductors, their presence enhances light absorption due to the Rayleigh scattering effect, promotes exciton dissociation in the Y6-BO phase, and forms an efficient hole transfer pathway from Y6-BO to PQDs and then to PM6 to improve hole transport. These contribute to increased short-circuit current density ( J SC ) and fill factor (FF) of OSCs with constant V OC . With the presence of 1 wt% CsPbBr 3 PQDs doping, the highest power conversion efficiency (PCE) of the corresponding PM6:Y6-BO OSC is improved from 16.4% to 17.1%, where the device stability has not been affected due to the better phase stability of CsPbBr 3 PQDs than CsPbI 3 PQDs. This work unravels a new approach to enhance the efficiency of OSCs by applying PQDs doping to manipulate the photon-to-electricity conversion process.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 36
·12118-12123
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IF 7.393
Bohan Li,Yuchi Zhang,Yan Xu,Zhiguo Xia
CsPbBr3 nanocrystals (NCs) with highly efficient narrow-band green emission are promising candidates in display applications. However, the poor stability of CsPbBr3 NCs is always a challenge for future development. Herein, we designed and prepared CsPbBr3 NCs encapsulated into zeolite Beta (denoted as CsPbBr3-Beta) composite via an optimized high temperature solid-state method, and the as-obtained power materials exhibited green emission peaking at 520 nm with a narrow full-width at half-maximum (FWHM) of 25 nm and a high photoluminescence quantum yield (∼61%). We further demonstrated the ultra-high luminescent stability of CsPbBr3-Beta composite by treating under a 150 °C treatment, soaking in water over 30 days, as well as applying in 450 nm light-emitting devices (LED) for 20 days. Ultimately, white-light-emitting devices (WLEDs) constructed by the green-emitting CsPbBr3-Beta composite and commercial blue chip and red K2SiF6:Mn4+ phosphor achieved a color gamut of 123.5% National Television System Committee standard (NTSC) and high luminous efficiency (LE = 95 lm W−1). This work highlights the encapsulation process and feasible solid-state reaction methodology to fabricate CsPbBr3 NCs confined in a microporous molecular sieve with high luminescent stability and performance, significantly expanding its great potential to be used in optoelectronic fields.
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Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 16
·6152-6159
·
IF 6.482
Xudong Hu,Yuelei Li,Ye Wu,Weiwei Chen,Haibo Zeng,Xiaoming Li
Copper halide Cs3Cu2X5 (X = Cl, Br, I) nanocrystals (NCs) have become a research hotspot in recent years. Compared with perovskite NCs, they have a large Stokes shift with a self-absorption-free effect and convenient solution processability, which endows them with potential applications in high-resolution flexible X-ray imaging and ultraviolet detection. However, the synthesis of Cs3Cu2I5 NCs is limited to the hot-injection method, which needs tedious operation procedures. Here, a one-pot fabrication strategy was designed based on the principle of chemical potential and thermodynamic equilibrium to achieve the mass production of Cs3Cu2I5 NCs. With the assistance of I−, Cs3Cu2I5 NCs were successfully fabricated with a reaction yield of about 70%, with the emission peak located at 445 nm and a high photoluminescence quantum yield (PLQY) of 72.6%. By scaling up the initial reaction volume tenfold, we successfully demonstrated mass production. Furthermore, Cs3Cu2Br5 and Cs3Cu2Cl5 NCs were also fabricated using this approach, indicating the versatility of this method. This strategy effectively optimizes the experimental process and cost, providing convenience for subsequent research based on this kind of material, such as optical electronic devices, ion-doping studies and so on.
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JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 27
·15029-15039
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IF 4.22
Wang Hongbo,Li Qian,Niu Xiaomeng,Du Jianxiu
A simple and feasible approach was constructed for preparation of all inorganic cesium lead bromide perovskite nanocrystals (CsPbBr 3 NCs) modified with tetraphenylporphyrin tetrasulfonic acid (TPPS). The CsPbBr 3 /TPPS nanocomposite has good water stability and exhibits a dual-emission property. Adopting the CsPbBr 3 /TPPS nanocomposite as a nanoprobe, a rapid, selective and sensitive ratiometric fluorescent method was developed for determination of sulfide ion. When sulfide ion was added into the CsPbBr 3 /TPPS nanocomposite, the bright green fluorescence of CsPbBr 3 NCs at 520 nm was sharply quenched, whereas the red fluorescence of TPPS at 650 nm was hardly influenced. The quenching is possibly attributed to destruction of CsPbBr 3 NCs via the formation of more stable PbS. This nanoprobe can determine sulfide ion over the range of 0.2–15.0 nmol·L −1 with a detection limit as low as 0.05 nmol·L −1 . The relative standard deviation is 3.3% at 10.0 nmol·L −1 concentration level ( n = 11). Sulfide ion content was successfully determined in different water samples by this nanoprobe. Graphical abstract
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Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 14
·3598-3605
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IF 6.367
Tangxi Chen,Min Zhou,Wen Chen,Yuyao Zhang,Siyong Ou,Yueli Liu
Halide perovskite quantum dots (HP QDs) have been widely used in the field of photocatalysis due to their excellent performance. However, the issues of lead toxicity and instability prevent their process in the photocatalysis application. Herein, the lead-free Cs2AgInCl6 perovskite quantum dots (CAIC QDs) are synthesized by the hot-injection method, and CAIC QDs@Ag composites with various Ag loading amounts are self-assembled by adjusting the Cl source in the synthesis process, which is used to improve the CO2 photoreduction efficiency by using the surface plasmon resonance (SPR) effect of Ag nanoparticles. In addition, the surface ligand density of CAIC QDs@Ag composites is regulated by the purification processing treatment to release the influence of organic ligands on the charge transport performance. It is found that the CAIC QDs@Ag composite with the optimal ligands density possesses fast electron transport and effective carrier separation efficiency, which are crucial for the improvement of the photocatalysis reaction. As a result, the CAIC QDs@Ag-2 composite after purification processing achieves the highest yield of 26.4 μmol g−1 and 28.9 μmol g−1 for CO and CH4, respectively, during the CO2 photoreduction process. In addition, there is no significant decline of CO2 photoreduction performance after the photocatalysis cycling test for 9 h, indicating the good stability of the CAIC QDs@Ag composite in the photocatalysis process.
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