OPTICAL MATERIALS
·
2019
·
IF 2.687
Jiang Wu,Haowen Bai,Wenjie Qu,Guanying Cao,Yanjie Zhang,Jingjie Yu
CsPbBr 3 quantum-dot borosilicate microcrystals and Eu 3+ -doped CsPbBr 3 quantum-dot microcrystals with different concentrations of Eu 3+ are successfully prepared by high temperature melting. The particle morphology of the microcrystals is characterized by scanning electron microscopy (SEM). The fluorescence characteristics are analyzed by fluorescence spectroscopy and CIE chromaticity coordinates . In this research, CsPbBr 3 quantum dots are effectively coated with borosilicate microcrystals to improve the stability of CsPbBr 3 quantum dots while ensuring its strong green emission at 517 nm. The energy transfer from CsPbBr 3 quantum dots to Eu 3+ occurs after doping. When changing the concentration of Eu 3+ , the emission peaks of perovskite broaden and blue shift occurs (517 nm→474 nm). The CIE color coordinate moves from (0.0807, 0.7200) to (0.4537, 0.2724). Therefore, the continuous adjustment of solid perovskite materials from green light to blue light and then to red light region is realized.
研究领域:
材料科学
·
纳米光学
·
无机非金属材料
·
光电子学
·
发光材料
·
固态化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Dongdong Liang,Zhiheng Xu,Dandan Yang,Zhibin Xu,Weitong Yin,Xiaobin Tang
Luminescence instability in service environments has limited the widespread use of halide perovskite materials, especially for X-ray energy conversion and detection/imaging. This work proposed a method for improving luminescence stability through polymer encapsulation, which is more convenient than compositional engineering and surface modulation. Meanwhile, the differences in the luminescence intensities of composite films synthesized by encapsulation of different polymer matrices and their luminescence stability under various harsh X-ray irradiation conditions were systematically investigated. The applications of the developed CsPbBr3-embedded polymer films with excellent luminescence performance and high service stability in X-ray radiation energy utilization and detection/imaging were discussed. The results show that CsPbBr3-embedded PS films can meet the spectral modulation requirements of radioluminescent materials for nuclear batteries and can also fulfill the needs of flexible X-ray imaging with a high spatial resolution.
研究领域:
材料科学
·
辐射物理
·
核工程
·
成像技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Zhenyao Liang,Liang Ni,Yang Zhang,Chen Yuan,Le Huang,Yibin Yang,Ye Xiao
The effects of elemental tellurium doping and decorating on the photoluminescence quantum yield (PL QY) and the environmental stability of the CsPbBr3 quantum dots (QDs) have been systematically studied. The PL spectra blue-shifts from 520 to 464 nm gradually with the increase in the amount of Te, and the full width at half-maximum (FWHM) increases from 20 to 62 nm and decreases to 27 nm accordingly. The morphology of the untreated samples has a rectangular shape with distinct boundaries, whereas the Te-doped samples have a semi-core–shell structure with partially coated CsPb2Br5 after tellurium doping. Furthermore, the apparent size of the nanocomposites increases to 20 nm, but the crystal size of the core decreases slightly according to the broadened peaks of X-ray diffraction (XRD). Further investigation by X-ray photoelectron spectroscopy shows that the binding energy of Pb–Br increases and Pb–Te bonds are formed in Te-doped samples, which can enhance the stability of QDs from the view of strengthening the chemical bonds and inhibiting the detaching behavior of bromine under moisture. At the nominal content of Pb/Te = 1:0.4, the thermal decomposition temperature of the QDs increases from 300 to 500 °C; the maximum of PL QY increases to 70% for the 1:0.4 sample and the relative PL peak intensity maintains 50% of the initial value after a 60 h aging simulation. Finally, the nanocomposite materials are fabricated into a white light-emitting device (WLED). Under the illumination of a commercial GaN chip, the device shows a good Commission Internationale de lEclairage (CIE) color coordination of (0.3291,0.3318).
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 17
·4793-4799
·
IF 5.976
Yongfeng Liu,Xiaosheng Tang,Tao Zhu,Ming Deng,Iroegbu Paul Ikechukwu,Wei Huang,Guolu Yin,Yongzhong Bai,Dingrong Qu,Xianbin Huang,Feng Qiu
Pollution triggered by highly toxic heavy metal ions has become a worldwide issue of concern, and has aroused increasing research interest, but it is still a challenge to carry out its trace detection in the organic phase using inorganic fluorescent colloidal nanocrystals (NCs). Herein, we report fully inorganic CsPbBr3 perovskite quantum dots (PQDs), which were synthesized via a hot-injection method, as a fluorescent probe for the selective detection of copper ions in hexane. The photoluminescence (PL) intensity of CsPbBr3 PQDs is significantly quenched within several seconds after the addition of Cu2+ due to effective electron transfer from the PQDs to the added Cu2+, which is experimentally verified via analyzing absorption spectra and PL decay lifetime. The sensor, in turn-off mode, has a detection range from 0 to 100 nM with a limit of detection (LOD) as low as 0.1 nM, indicating great potential for practical applications. This study paves the way for PQD-based fluorescent probes for heavy metal detection in the organic phase.
研究领域:
环境科学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Applied Optical Materials
·
2023
·
IF 0
Huazheng Li,Gaoling Zhao,Bin Song,Weixia Dong,Gaorong Han
In recent years, deep-blue perovskite light-emitting diodes (PeLEDs) based on ultra-small CsPbBr3 quantum dots (QDs) have attracted increased attention. However, ultra-small CsPbBr3 QDs tend to have more defects and more nonradiative processes because of their ultrafast nucleation and growth rates. How to suppress the nucleation and growth rate is an important issue for developing deep-blue emitting CsPbBr3 QDs with high performance. Herein, a modified hot-injection method (MM) is designed for suppressing the growth process of CsPbBr3. The ligands of oleic acid (OA) and oleylamine (OAm) are employed instead of octadecene (ODE) as the solution, and as a result, the strong confined and high-quality CsPbBr3 QDs (∼4.45 nm) are obtained, presenting strong deep-blue emission (≈465 nm) with a photoluminescence quantum yield (PLQY) of 95%, an average lifetime of 8.84 ns, and a large exciton binding energy of 268.7 meV, which can maintain blue emission over 30 days under atmospheric conditions. Compared with the CsPbBr3 nanocubes (NCs) obtained by the common hot-injection method (CM), the CsPbBr3 QDs obtained by MM have fewer defects and trap states, resulting in less nonradiative processes. In addition, the fabricated PeLEDs based on the above CsPbBr3 QDs show deep-blue emission with Commission Internationale de l’Eclairage (CIE) color coordinates of (0.129 and 0.074), which is better than the blue standard of the National Television Standards Committee (NTSC). Evidently, this work provides a way to synthesize ultra-small CsPbBr3 QDs and also reflects the important influence of the reaction solvent on perovskite synthesis.
研究领域:
材料科学
·
纳米技术
·
光电工程
✓ 已验证
DOI
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Meiting Yang,Qin Wang,Yao Tong,Lanlan Zhai,Weidong Xiang,Xiaojuan Liang
All-inorganic perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals (NCs) are becoming a critical material for the narrow-band fluorescent material in the field of backlit displays. Herein, CsPbBr 3 (CPB) NCs glasses with finely adjustable wavelength were successfully prepared in the narrow range of 522–533 nm by controlling the content of MgO in borosilicate glass matrix. It is surprising that the addition of MgO enhances the optical properties of CPB NCs, as well as improves their stability. Furthermore, in order to verify its application in backlight display, the light conversion film with a color gamut of up to 129% of NTSC 1953 was successfully prepared, displaying more details of object color on the liquid crystal display (LCD) screen compared with commercial one. These results undoubtedly provide a broad road for wide color gamut backlight display with respect to perovskite nanomaterials.
研究领域:
材料科学
·
光学工程
·
显示技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xingyue Liu,Xianhua Tan,Zhiyong Liu,Bo Sun,Junjie Li,Shuang Xi,Tielin Shi,Guanglan Liao
All-inorganic CsPbBr 3 perovskite has triggered great interests in photovoltaic field owing to its superior stability. However, the uncontrollable CsPbBr 3 film growth in solution always leads to a poor film quality with low phase-purity as well as many surface and bulk defects. Herein, we demonstrate an environmentally friendly non-solution route to fabricate high-quality CsPbBr 3 films for carbon-based planar perovskite solar cells . By precisely tuning the thickness ratio of the evaporated CsBr to PbBr 2 precursors ( r ), the dominant phase conversion of the cesium lead bromide perovskites from PbBr 2 -rich CsPb 2 Br 5 ( r ≤ 12:7) to CsPbBr 3 ( r = 12:8), and further to CsBr-rich Cs 4 PbBr 6 ( r ≥ 12:9) are achieved. The optimized CsPbBr 3 perovskites are highly phase-pure and crystallized with ultra-high light absorption ability. The as-prepared CsPbBr 3 films also exhibit a dense and uniform morphology with large grain sizes and monolayer-vertical aligned grains. The corresponding devices deliver a champion PCE of 7.58%, which is an excellent efficiency among carbon-based CsPbBr 3 cells with evaporated CsPbBr 3 light absorbers. The large-area (1 cm 2 ) devices also achieve an efficiency of 6.21%. Moreover, the unencapsulated CsPbBr 3 devices present superior moisture and thermal stabilities. Our work provides a facile approach to fabricate high-quality and large-area CsPbBr 3 films for highly efficient solar cells, light-emitting diodes and photodetectors .
研究领域:
材料科学
·
能源科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Materials Advances
·
2024
·
IF 5.2
Premkumar Sellan,Manigandan Selvan,Abida Perveen,Din Nasrud,Sakthivel Chandrasekar,Pitchaikannu Venkatraman,Devaraj Nataraj,Byung Seong Bae,Damian Chinedu Onwudiwe,Lei Wei
Perovskite materials are potential photo-absorbers, and their solution-processed perovskite layers are widely reported in photodetection devices. However, defects in perovskites pose a serious challenge to device performance. One possible way to overcome this set-back is growing a perovskite single crystal and deploying it in photon detection devices. Herein, we report the growth of pure and Bi-doped CsPbBr3 perovskite single-crystals and their high-energy photodetection characteristics. The Bi-doped CsPbBr3 perovskite single-crystals exhibited good photodetection characteristics in the visible, X-ray and gamma-ray regions. Under an illumination of 470 and 530 nm, the Bi-doped CsPbBr3 perovskite single-crystal photodetector displayed a linear response for the biasing voltage ranging from 2 V to 5 V. The device displayed a higher magnitude of photocurrent and exhibited a better ON/OFF ratio of ∼596 at λ = 470 nm and ∼24 at λ = 530 nm. The gamma ray detection properties of the Bi-doped CsPbBr3 perovskite single crystal were studied using two different radioactive sources with varying activity levels. A characterization study using a portable X-ray device revealed an excellent response to varying tube voltages and currents. The present study reveals the versatility of the Bi-doped CsPbBr3 perovskite single-crystals in photon detection under a wide range of illumination.
研究领域:
材料科学
·
辐射检测
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jin-Feng Liao,Yang-Fan Xu,Xu-Dong Wang,Hong-Yan Chen,Dai-Bin Kuang
Though coating CsPbBr3 nanocrystal (NC) with an outer layer has been regarded as an effective strategy to address its instability issues, deep investigations into the electronic interaction between CsPbBr3 NC and coating layer have yet to be conducted. In this study, the dynamics of hot carrier and charge carrier of CsPbBr3 nanocrystal with various MO2 (M = Si, Ti, Sn) coating layers have been comprehensively studied. Combined transient optical characterizations (time-resolved photoluminescence and ultrafast transient absorption) and photoelectrochemical measurements reveal that coating with insulating SiO2 accelerates the hot carrier relaxation and enhances the radiative recombination by passivating surface traps, whereas efficient charge-carrier separation and extraction are observed after coating with SnO2 and TiO2. The electron injection from CsPbBr3 NC to SnO2 (1.14 × 108 s–1) is 2-fold faster than to TiO2 (5.4 × 107 s–1) owing to the lower conduction band edge and the higher electron mobility of SnO2. Particularly, the first time fabricated CsPbBr3 NC/SnO2 composite exhibits superior stability against UV light and moisture, as well as the best photocurrent response in this study. This work has implied that rational design of the coating layer for perovskite NC can not only improve the stability but also tailor the electronic and optoelectronic properties for various applications.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Mengmeng Yu,Duo Zhang,Yaobin Xu,Jing Lin,Chao Yu,Yi Fang,Zhenya Liu,Zhonglu Guo,Chengchun Tang,Yang Huang
Surface ligand engineering is of great importance for the preparation of one-dimensional (1D) CsPbBr 3 nanowires for high-performance photodetectors. The traditional long-chain terminated ligands such as oleylamine/oleic acid (C18) used in the preparation of CsPbBr 3 nanowires will form an electrically insulating layer on the surface of the nanowires, which hinders the effective transport of charge carriers in optoelectronic devices. In this paper, short-chain ligands, including dodecylamine/dodecanoic acid (C12), octylamine/octanoic acid (C8) and hexylamine/hexanoic acid (C6), are introduced to partially replace long-chain ligands (C18) to successfully prepare various CsPbBr 3 nanowires via a solvothermal method. Microstructure characterization indicates that the four kinds of nanowires before/after surface ligand engineering, which are named as C18-CsPbBr 3 , C12/18-CsPbBr 3 , C8/18-CsPbBr 3 and C6/18-CsPbBr 3 , all have high aspect ratio and purity. As compared with CsPbBr 3 with long-chain terminated ligands, the C8/18-CsPbBr 3 and C6/18-CsPbBr 3 nanowires with shorter chain ligands exhibit superior photoluminescence (PL) performance and stability under adverse conditions such as ultraviolet irradiation and high temperature. The constructed photodetectors based on C8/18-CsPbBr 3 and C6/18-CsPbBr 3 nanowires have shown improved performances. This work provides a new idea for the preparation of CsPbBr 3 nanowires with high optical properties, stability and charge transport, and the prepared CsPbBr 3 nanowires have potential application prospects in optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 15
·8905-8909
·
IF 3.119
Jingchen Hua,Xi Deng,Cheng Niu,Fuzhi Huang,Yong Peng,Wangnan Li,Zhiliang Ku,Yi-bing Cheng
All-inorganic CsPbBr3 perovskite solar cells have triggered incredible interest owing to their superior stability, especially under high temperature conditions. Different from the organic–inorganic hybrid perovskites, inorganic CsPbBr3 perovskite always need a high annealing temperature for the formation of a cubic phase. Generally, the higher temperature (over 300 °C) and longer annealing time will promote the growth of CsPbBr3, resulting in larger grain sizes and lower trap density in the crystals. However, CsPbBr3 perovskite can also be damaged by excessive annealing temperature (∼350 °C) and time, since PbBr2 only has a melting temperature close to 357 °C. To address this issue, herein, we developed a novel pressure-assisted annealing method to prevent the sublimation of PbBr2 at high temperature. The CsPbBr3 films were firstly deposited by sequential thermal evaporation, and then annealed at 335 °C in an alloy pressure vessel. By controlling the pressure of the vessel, we obtained CsPbBr3 films with various morphologies. At normal atmospheric pressure, the as-prepared CsPbBr3 film exhibited small grain sizes and was full of pinholes. With the increase of annealing pressure, the grain sizes of the film showed a significant increasing trend, and the pinholes gradually vanished. When the pressure value came to 10 MPa, compact and uniform CsPbBr3 films with large grain sizes were obtained. Based on these films, CsPbBr3 perovskite solar cells with FTO/compact-TiO2/CsPbBr3/carbon architecture achieved a champion power conversion efficiency of 7.22%.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 4
·512
·
IF 3.236
Song Wang,Yan Xu,Renjie Chen,Mengmeng Zhu,Muyi Wang,Mengmeng Cao,Yunpeng Liu,Haojie Ding,Shulan Zhang,Jueyao Bai,Jun Ren,Tongtong Xuan,Huili Li
All-inorganic halide perovskite nanomaterials have a high application potential in the field of display and lighting because of unique photoelectric properties. However, these materials suffer from problems related to poor water and thermal stabilities. In this study, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites that were synthesized by a saturated recrystallization method at room temperature showed an enhanced photoluminescence quantum yield of 87% and superior water and thermal stabilities to that of undoped perovskites. Finally, green Eu3+-doped CsPbBr3/Cs4PbBr6perovskite composites were fabricated into white light-emitting diodes (WLEDs) with a wide color gamut (124% of the National Television System Committee standard) and a high efficiency of 43.06 lm/W.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
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