ADVANCED FUNCTIONAL MATERIALS
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2025
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IF 19
Chaomin Dong,Guoyi Chen,Shuxin Wang,Zhiqiu Yu,Weijun Ke,Guojia Fang
Quasi-2D metal halide perovskites light-emitting diodes (PeLEDs) are promising candidates for next-generation light-emitting diodes due to their excellent photoelectric properties and convenient solution preparation. However, challenges remain in suppressing the formation of low- n phases while enhancing the quantum confinement effect. Here, a co-modification strategy is adopted that combines organic amine cations with different molecular structures to improve quasi-2D perovskite performance. Specifically, the addition of Amantadine hydrobromide (AMAN), which features a large steric hindrance, effectively disrupted phenethylammonium bromide (PEABr) aggregation. This steric hindrance isolated PEABr molecules, thereby preventing the formation of low- n phases (e.g., n ≤3) and promoting a concentrated phase distribution. The crystallization kinetics of the quasi-2D perovskite films are further investigated using in situ photoluminescence. Results showed that AMAN delayed the nucleation and crystallization processes by adsorbing onto the perovskite surface and impeding epitaxial crystal growth. This inhibition reduced crystal size, strengthened the quantum confinement effect, and improved the photoluminescence quantum yield (PLQY). As a result, the champion device achieved an external quantum efficiency of 30.84%. This co-modification strategy, which effectively suppresses low- n phases while enhancing exciton binding energy and PLQY, provides valuable insights into designing molecular structures for optimizing the performance of quasi-2D perovskite light-emitting diodes.
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BIOSENSORS & BIOELECTRONICS
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2024
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IF 10.7
Jian-Hong Zhu,Haiquan Wang,Junli Guo,Junjian Zhao,Zhida Gao,Yan-Yan Song,Chenxi Zhao
As pure antipodes may differ in biological interactions, pharmacology, and toxicity, discrimination of enantiomers is important in the pharmaceutical and agrochemical industries. Two major challenges in enantiomer determination are transducing and amplifying the distinct chiral-recognition signals. In this study, a light-sensitive organic photoelectrochemical transistor (OPECT) with homochiral character is developed for enantiomer discrimination. Demonstrated with the discrimination of glucose enantiomers , the photoelectrochemically active gate electrode is prepared by integrating Au nanoparticles (AuNPs) and a chiral Cu(II)-metal-organic framework ( c -CuMOF) onto TiO 2 nanotube arrays (TNT). The captured glucose enantiomers are oxidized to hydrogen peroxide (H 2 O 2 ) by the oxidase-mimicking AuNPs-loaded c -CuMOF. Based on the confinement effect of the mesopocket structure of the c -CuMOF and the remarkable charge transfer ability of the 1D nanotubular architecture, variations in H 2 O 2 yield are translated into significant changes in OPECT drain currents ( I D ) by inducing a catalytic precipitation reaction. Variations in I D confer a sensitive discrimination of glucose enantiomers with a limit of detection (LOD) of 0.07 μM for L-Glu and 0.05 μM for D-Glu. This enantiomer-driven gate electrode response strategy not only provides a new route for enantiomer identification, but also helps to understand the origin of the high stereoselectivity in living systems.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
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2024
·Vol. 40
·期 3
·556-560
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IF 3.1
Ko Pui Kei,Halpert Jonathan E.
The halide migration effect in mixed-halide lead-based perovskite is a serious problem hindering the development of its display technology. In this study, we have successfully addressed this issue by reporting formadinium (FA) doped mixed-halide perovskite nanocrystals (NCs) with ultra-deep-blue emission of 450 nm, narrow bandwidth of 16 nm, and a high photoluminescence quantum yield (PLQY) of 66%. The perovskite nanocrystal light-emitting diodes (NC-LEDs) using this nanocrystal as an active layer achieved a maximum external quantum efficiency (EQE) of 0.32%, 30-fold improved compared to that of pristine and stable electroluminescence (EL) spectra at 450 nm under a 4.9–8.0 V bias. These findings demonstrate the potential of our approach in developing stable and efficient deep blue perovskite NC-LEDs.
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MATERIALS RESEARCH BULLETIN
·
2024
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IF 5.3
Yanxue Yue,Jingting Xiao,Weiyu Zhu,Bo Zhang,Rongbo Hou,Alhadi Ishag,Yubing Sun
The introduction of MoS 2 is beneficial to the separation and transfer of photogenerated electron–hole pairs for CdS/TiO 2 . Herein, MoS 2 /CdS/TiO 2 composites were synthesized by one-step solvothermal method at 200 °C and applied to photocatalytic reduction of U(VI) from aqueous solutions. The batch characterizations showed the irregular spherical MoS 2 /CdS/TiO 2 composites with low bandgap (1.95 eV) and high chemical stability. MoS 2 /CdS/TiO 2 composites displayed the rapid removal rate of U(VI) (more than 90 % under 15 min illumination), good regeneration (> 91 % after four cycles) due to the highly efficient separation of electron-hole pair. The possible photocatalytic pathway was demonstrated to be the main active ·O 2 − radical by quenching experiments, ESR and XPS analysis. This work highlights the potential application of MoS 2 /CdS/TiO 2 on removal of radioactive wastewater in the actual remediation.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
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IF 6.3
Yunqi Wang,Xinyu Tan,Xiongbo Yang,Guiguang Qi,Yiteng Tu
The rising temperature of ground objects under solar irradiation has led people to an increasing dependence on cooling methods that consume huge energy such as air conditioners and fans. Building windows and vehicle windows also have caused huge losses of energy due to allowing sunlight to enter. Therefore, it is of great significance to simultaneously endow outdoor application materials with radiative cooling capacity and adjustable light transmittance. In this study, hydroxypropyl cellulose (HPC) hydrogel radiative cooler was developed with high emissivity (0.96) and excellent visible light modulation ability (ΔT lum ) with a high maximum transmittance (91.2 %) and ΔT lum (83.8 %). An ultra-low phase change temperature of 45 °C is achieved to meet insulation requirements and energy saving targets under hot climatic conditions. In the outdoor experiment, the HPC hydrogel radiative cooler can reduce the temperature by approximately 5 °C and 15 °C compared with the ordinary glass and aluminum sheet. The HPC hydrogel after phase transformation shows excellent cooling effect on different substrates such as glass and aluminum sheet. After 20 heating/cooling cycles and one month of exposure, the transmittance and ΔT lum of the cooler have no obvious changes. The significant temperature rise suppression effect and transmittance adjustable performance of the HPC hydrogel radiative cooler opens up a promising avenue for application.
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Applied Materials Today
·
2025
·
IF 6.9
Onome Ejeromedoghene,Moses Kumi,Samson Olusegun Afolabi,HuaGuang Wang,Fatai Oladoyinbo,Zexin Zhang
Light and magnetic responsive hydrogels, which demonstrate distinct responses by incorporating magnetic particles into photochromic hydrogels, have attracted considerable interest for their potential applications in smart optical devices. This study employs WO 3 nanocomposites, derived from magneto-centric deep eutectic solvents (DES), to modulate the magnetic and photochromic behavior of hydrogel system containing hydroxyethyl methacrylate (HEMA) and acrylamide (Am), i.e. p(HEMA/Am). The well-dispersed WO 3 nanocomposites in p(HEMA/Am)@WO 3 hydrogel lead to a 15-fold increase in its magnetization. Furthermore, the incorporation of the DES-based WO 3 nanocomposites enables a rapid photochromic response under UV-light irradiation, due to intermolecular charge transfer (ICT) between the WO 3 nanocomposites and the hydrogel matrix. Computational studies based on DFT calculations elucidate the charge transfer mechanism and validate the experimental results. The molecular orbital and the energy gap calculations confirm that WO 3 greatly improves electron transport in the hydrogel. The p(HEMA/Am)@WO 3 hydrogel exhibits excellent light-responsive, reversible pattern formation on its surface under UV irradiation, thereby evidencing its superior repeatability in writing and erasing information. The study highlights the significant contribution of DES-based nanocomposites in synthesizing photochromic hydrogels, underscoring their importance in advancing optical materials. Moreover, this research lays the foundation for designing photochromic materials for rewritable displays and information storage systems.
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NANOTECHNOLOGY
·
2024
·Vol. 36
·期 9
·095202
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IF 2.9
Lin Zhang,Peiyu Cheng,Yongqiang Du,Quan Wang
Molybdenum disulfide (MoS2) possesses excellent potential for applications in the field of optoelectronic detection. However, the atomic-level thickness of the monolayer MoS2 leads to weak light absorption and a restricted absorption spectrum. The performance of monolayer MoS2 devices has reached a bottleneck. Fortunately, the above issues can be effectively solved by coupling with various types of photosensitivity nanostructures. In this work, we integrated MoS2 quantum dots (QDs) with high efficient light absorption with monolayer MoS2 to fabricate 0D/2D MoS2 QDs/MoS2 hybrid dimensional homojunction photodetectors. In this structure, MoS2 is used as an efficient carrier transport channel, while MoS2 QDs act as effective light absorbers to enhance the local electric field around MoS2. The synergistic effect of MoS2 QDs and MoS2 is utilized to accelerate the migration rate of photogenerated carriers in the structure, and in particular, the highest responsivity of the MoS2 QDs/MoS2 hybrid device is 27.6 A W−1 with the detectivity as high as 2.13 × 1011 Jones under 532 nm laser, which is an order of magnitude higher than that of the pristine MoS2 devices. The synergistic effect of MoS2 QDs with monolayer MoS2 is verified by finite-difference time-domain simulation. The results will pave the way for the future development of high-performance MoS2-based photodetectors.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Jiaojiao Zhang,Tianyi Zhang,Da Teng,Zihui Meng,Lili Qiu
Photocatalytic oxidation technology using solar energy is an effective strategy to solve environmental pollution and energy shortage. To avoid angle dependence of traditional photonic crystal photocatalysts and address the limitations of high charge recombination rate and low light utilization of TiO 2 , this study proposed a novel inverse opal TiO 2 /CdS photonic crystal beads (IO TiO 2 /CdS PCBs) photocatalyst. By leveraging the synergistic coupling of PCBs’ slow light effect and TiO 2 /CdS heterojunction, the photocatalytic activity was significantly enhanced. The results revealed that the PCBs matching the blue edge with TiO 2 ′s electronic band gap (IO TiO 2 -140 PCBs) exhibited the highest apparent rate constant of 0.01901 min −1 . By introducing CdS to form a heterojunction with TiO 2 , the photocatalytic performance was further improved by effectively inhibiting the recombination of photogenerated carriers. The degradation rate of RhB reached 96.6 % in 60 min, outperforming that of IO TiO 2 at 65.1 %, with the rate constant increasing by 3.1 times. Electron spin resonance and trapping experiments indicated that h + was the main active specie, and the possible reaction mechanism path was proposed. The combination of “extrinsic” modifications by doping CdS and “self-structural” modifications by shaping TiO 2 into periodic IO PCBs structure provided a systematic insight on the design of novel photocatalysts.
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OPTICAL MATERIALS
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2024
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IF 3.8
Shijie Du,Xicai Lai
CH₃NH₃PbI₃ (MAPbI₃) perovskites have demonstrated significant potential in optoelectronic devices. However, the stability and performance of these applications are critically influenced by electric fields and light soaking effect (LSE). The mechanisms by which these factors affect the photoluminescence (PL) and time-resolved photoluminescence (TRPL) characteristics of MAPbI₃ thin films are not yet fully understood. In this study, we constructed a symmetric lateral electrode structure (ITO/MAPbI₃/ITO) to systematically analyze the impact of varying electric field strengths and LSE wavelengths on the PL and TRPL characteristics of MAPbI₃ thin films. Our experimental results reveal that bias voltage significantly influences carrier recombination processes and transfer rates. Both forward and reverse bias voltages exhibit similar effects on the symmetric lateral electrode ITO/MAPbI 3 /ITO structure. As the bias voltage increases, the steady-state PL intensity of MAPbI 3 films decreases, and the TRPL decay time shortens. Additionally, our studies on different LSE indicate that higher photon energy has a more pronounced impact on the TRPL lifetime of MAPbI 3 films. This research elucidates the mechanisms by which electric fields and LSE affect the photophysical properties of MAPbI 3 perovskite films, providing new insights for optimizing the performance of these materials in optoelectronic devices.
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Advanced Optical Materials
·
2024
·
IF 8
Lihui Liu,Yun Wang,Chenxi Liu,Jian Chen,Zijie Hou,Xuejing Liu,Kun Cao,Wei Shen,Shufen Chen
Metal halide perovskite light-emitting diode (PeLED) is the most promising candidate for next-generation display technology. However, the development of the blue PeLEDs is far behind the expectations. Mixed-halide perovskites demonstrate to be the most facile method to realize blue emission, which confronts serious spectra stability problem arising from the halide segregation. Here, a polymerizable passivator is introduced into the Cl/Br-mixed perovskites, which can simultaneously cross-link perovskite grains by interconnecting halides through hydrogen bonding, and transport the carriers through its π-conjugated backbone. Consequently, this cross-linked blue perovskite film demonstrates a significantly improved spectra stability under various external stimuli of high humidity, UV radiation, and electrical field, and the corresponding PeLED yields a decent external quantum efficiency of 12.0% at high brightness of 3390 cd m −2 with the emission at 478 nm. Notably, this work provides a unique cross-link agent with in situ polymerizability to address the ion migration and phase segregation issues without sacrificing the conducting capacity in mixed-halide perovskites.
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RADIATION PHYSICS AND CHEMISTRY
·
2024
·
IF 2.8
Jin Dong Cho,Chang Heon Choi,Heerim Nam,Jung-in Kim
The aim of this study is to evaluate and compare the dose sensitivity and ambient light resistance of radiochromic plastic dosimeters (RPDs) incorporating mixed azo compound with those incorporating individual azo compounds. RPDs were fabricated using a mixture of polyurethane , leuco dye, initiator, and solvent. In this study, three azo compounds (tartrazine, sunset yellow , and allura red) were incorporated into RPDs either individually or in combination. Thus, we produced five dosimeter types: one original RPD (A) without azo compounds, three RPDs (B, C, D) with individual azo compounds, and one RPD (E) with mixed azo compounds. Initially, to compare dose response and sensitivity, one group of each sample was delivered to doses ranging from 0.2 Gy to 3 Gy with 6 MV photon beams at 600 cGy/min. To assess ambient light resistance, another group was exposed to light for varying durations. Following irradiation and light exposure, optical density (OD) was obtained using a cone-beam optical CT scanner for each group. Wavelength spectra for each sample were acquired using a spectrometer. This study encompassed analysis and comparison of dose response curves, sensitivity, and netOD-time graphs among samples. Additionally, the absorption wavelength spectra of the samples were compared with the light spectrum emitted by a light bulb. The dose response curves were represented by linear functions, with the slope indicating the sensitivity of each sample. The sensitivity for samples A-E were 0.0759, 0.0988, 0.0902, 0.0809, and 0.1013 ΔOD/Gy, respectively. Samples B-E demonstrated increases in sensitivity of 30.1%, 18.8%, 6.5%, and 33.4%, respectively, compared to sample A. Sample E, which incorporated mixed azo compounds, demonstrated the highest sensitivity and remarkable resistance to ambient light. The results suggested that all azo compounds influenced the sensitivity of the RPDs, and that mixed azo compounds does not reduce the sensitivity of the RPDs. The ambient light resistance was dictated by the overlap between the light bulb's wavelength and the azo dyes' absorption range, which for mixed azo compounds spanned widely from 300 nm to 600 nm. The mixed azo compounds, as opposed to a single azo compound , allowed for the absorption of a wider range of light wavelengths, leading to an increased resistance to ambient light. Our study demonstrated that the inclusion of azo compounds enhances the sensitivity of RPDs. Specifically, the use of mixed azo compounds provided the highest sensitivity and exhibited superior resistance to ambient light. This improved performance can be attributed to the broader absorption wavelength spectrum achievable with mixed azo compounds, enabling absorption across a wider range of light wavelengths. These findings highlight the potential utility of mixed azo compounds in the fabrication of RPDs, enhancing their function as highly sensitive and resistant dosimeters to ambient light.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Kaiyu Yang,Baolin Xu,Qiuxiang Lin,Yongshen Yu,Hailong Hu,Fushan Li
Perovskite light-emitting diodes (PeLEDs) have attracted wide attention due to their excellent photoelectric properties. A variety of additives have been studied for perovskite emission layers to enhance the performance of PeLEDs. However, the buried interface, which also has significant influence on the crystallization kinetics and exciton recombination dynamics of the perovskite emission layer, remains to be explored. In this work, we introduced a new ionic liquid 1-Ethyl-3-methylimidazolium dicyanamide (EMIM DCA) with the characteristics of low viscosity and high conductivity into the interfacial layer between the hole transport layer (HTL) and the perovskite film. Due to the strong interaction between the EMIM DCA and perovskite, the crystallization of the perovskite film is obviously improved and the defects at the interface are well passivated. As a result, the nonradiative recombination in the interlayer is significantly reduced. In addition, the introduction of EMIM DCA promoted the injection of charge carriers, thus achieving a high luminance of 32310 cd m −2 and enabling the maximum external quantum efficiency (EQE) of the PeLEDs increased from 10.2 % to 18.7 %.
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