ACS Omega
·
2021
·
IF 3.512
Yu Ji,Jian-Bin Zhang,Hao-Ran Shen,Zhan Su,Hao Cui,Tao Lan,Jia-Qian Wang,Yu-Hui Chen,Lihui Liu,Kun Cao,Wei Shen,Shufen Chen
The wide application of CsPbI3 nanocrystals (NCs) is limited due to their poor phase stability. We reported that Mn2+-CsPbI3 NCs have better optical performance and phase stability. With a suitable Mn/Pb ratio (5.0%), Mn2+-doped α-CsPbI3 NCs exhibited the best stability under UV irradiation, ethanol addition, and heating. Under UV irradiation and addition of ethanol, photoluminescence (PL) intensities of CsPbI3 NCs could be only preserved up to 35% (22 min UV irradiation) and 10% (ethanol addition), respectively, whereas, Mn2+-doped CsPbI3 (5.0%) exhibited much improved stability, and their intensities could be preserved up to 70% (22 min UV) and 58% (ethanol), respectively. It should be noted that crystal-phase stability could be maintained at least 7 h even at 120 °C. We believe that the improved stability in extreme conditions for α-CsPbI3 NCs can be further applied to optoelectronic devices.
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
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Chunyu Sun,Xinzhan Wang,Yanmei Xu,Wanbing Lu,Xiaoyun Teng,Guangsheng Fu,Wei Yu
CsPbI 3 nanocrystals (NCs) with photoluminescence quantum yield (PLQY) larger than 90% have been synthesized at different temperature regions, and the physical origins for high PLQY were investigated. HRTEM images show that cubic phase CsPbI 3 (α-CsPbI 3 ) is surrounded by hexagonal Cs 4 PbI 6 in the low temperature region, and the ratio of CsPbI 3 and Cs 4 PbI 6 increases with increasing the reaction temperature. The strong confinement effect of Cs 4 PbI 6 leads to the high PLQY (95%) of α-CsPbI 3 NCs when the reaction temperature is 120 °C. The confinement effect of Cs 4 PbI 6 is weakened with increasing reaction temperature, which leads to the decrease of PLQY at 140 °C. However, non-radiative recombination is suppressed due to the microstructure improvement with further increasing the reaction temperature, and PLQY as high as 97% is achieved at 180 °C. Stability testing shows that fast degradation of α-CsPbI 3 NCs occur in low reaction temperature region, and α-CsPbI 3 NCs with high PLQY can be stored in air for 90 days when the reaction temperature is 180 °C.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 36
·期 9
·095203
·
IF 2.9
Xiaozong Huang,Wen Li,Linghang Kong,Xiaoyan Lu,Chengzhi Yang,Bingsuo Zou
Due to the easy transformation to the non-luminous yellow δ-CsPbI3 phase in air, α-CsPbI3 nanocrystalline materials with red light emission find limited applications. Lifting its structural stability is a challenge in its quantum dot (QD) lighting field. Here we studied the doping of Mn2+ ions (5.0%) and processing by a small amount (0.315 ml) of TOP molecules on the OA-capped CsPbI3 nanocrystals. It is found that after the successful introduction of Mn2+ into the CsPbI3 nanocrystal, the grain size reduces, which leads to a stronger quantum confinement effect than the undoped QDs, which leads to the blue shift of PL and absorption spectra. The incorporation of Mn2+ simultaneously reduced defects and lifted the luminescence efficiency and lifetimes of QDs, the cause for the above optical behavior is due to the formation of excitonic magnetic polaron (EMP) excitons near the bandedge. On the other hand, the treated TOP molecule on the OA-capped NCs did not significantly affect their room-temperature luminescence. However, it improved the low-temperature emission performances of QDs significantly. Moreover, the TOP-treated QDs fixed in the PMMA film can transform into rod-like shapes in acidic environments, giving strong stability for emission, especially for the Mn-doped CsPbI3 QDs. This work has been done to improve the stability and emission efficiency of related QDs through the EMP formation near band-edge and surface modification of CsPbI3 NCs, favoring their potential applications in display and low-temperature light-emitting devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Siqi Sun,Min Lu,Jie Guo,William W. Yu,Zhifeng Shi,Guang Sun,Yu Zhang
Improved device performance of perovskite light-emitting diodes (LEDs) is demonstrated through the synergistic effect of the optimized CsPbI3 nanocrystals (NCs) as the emissive layer (EML) and ZnO/C60 bilayer as electron transport layers (ETLs). The optical characteristics of the CsPbI3 NCs were optimized by strictly controlling the feeding ratio of Cs:Pb:I to 1:1:3 in the synthesis processes of NCs, which leads to enhanced photoluminescence quantum yields (PL QY) from 65% to 92%. Additionally, the introduction of C60 not only optimized the energy level structure of the device, leading to more balanced charge injection and transport, but also smoothed the surface of the ZnO film and perovskite NCs. Consequently, a peak external quantum efficiency (EQE) of 10.7% and maximum luminance of 1377 cd m–2 were achieved.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Research
·
2021
·
IF 0
Wei Shen,Jianbin Zhang,Ruimin Dong,Yanfeng Chen,Liu Yang,Shuo Chen,Zhan Su,Yujun Dai,Kun Cao,Lihui Liu,Shufen Chen,Wei Huang
α-CsPbI3 nanocrystals (NCs) with poor stability prevent their wide applications in optoelectronic fields. Ca2+ (1.00 Å) as a new B-site doping ion can successfully boost CsPbI3 NC performance with both improved phase stability and optoelectronic properties. With a Ca2+/Pb2+ ratio of 0.40%, both phase and photoluminescence (PL) stability could be greatly enhanced. Facilitated by increased tolerance factor, the cubic phase of its solid film could be maintained after 58 days in ambient condition or 4 h accelerated aging process at 120°C. The PL stability of its solution could be preserved to 83% after 147 days in ambient condition. Even using UV light to accelerate aging, the T50 of PL could boost 1.8-folds as compared to CsPbI3 NCs. Because Ca2+ doping can dramatically decrease defect densities of films and reduce hole injection barriers, the red light-emitting diodes (LEDs) exhibited about triple enhancement for maximum the external quantum efficiency (EQE) up to 7.8% and 2.2 times enhancement for half-lifetime of LED up to 85 min. We believe it is promising to further explore high-quality CsPbI3 NC LEDs via a Ca2+-doping strategy.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 20
·10556-10564
·
IF 11.9
Shengwen Zou,Jun Kang,Yuzheng Zhang,Mingjing Qi,Xiaojun Yan,Xiaoliang Zhang,Jianmei Huang
CsPbI3 as a newly emerging semiconductor material has displayed tremendous prospects for optoelectronic applications. However, the poor photoactive black-phase stability limits its further application. In this work, we introduce transition metal nickel ion (Ni2+) as a B-site substitute into CsPbI3 nanocrystals (NCs) to stabilize their black phase. The optimized CsPbI3 NCs film presents a record photoactive black-phase stability time of 54 hours under the conditions of 85 °C and 85% relative humidity, over 108 times that of the undoped film. Furthermore, the Ni2+-doped CsPbI3 NCs solutions maintain bright red emission after vigorous stirring with an equal volume of water for 200 hours (the undoped solution is almost completely quenched), and also show bright red emission after being stored in the air for 200 days (the undoped solution is completely quenched within 43 days). Meanwhile, the photoluminescence quantum yield increased from 31.48% for undoped CsPbI3 NCs to 87.69% for doped Ni-3.65% CsPbI3 NCs. We suggest that these outstanding stabilities and excellent optical properties can mainly be attributed to the increased defect formation energy after rational Ni doping and lattice adjustment by partial replacement of Pb2+ with small-sized Ni2+. Our work provides guidance for the synthesis of phase-stabilized CsPbI3 NCs and an insight into the effect of B-site doping in a perovskite lattice, providing a promising pathway to construct stable and efficient photoelectronic devices.
研究领域:
材料科学
·
光电材料
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 17
·2207312
·
IF 13.3
Jie Fu,Jun Liu,Lin Yuan,Qi Pan,Shuhua Chen,Yiqi Hu,Jinxing Chen,Wanli Ma,Qiao Zhang,Zeke Liu,Muhan Cao
All-inorganic lead halide perovskite nanocrystals (NCs) emerge as a rising star in photovoltaic fields on account of their excellent optoelectronic properties. However, it still remains challenging to further promote photovoltaic efficiency due to the susceptible surface and inevitable vacancies. Here, this work reports a 3D/2D core/shell perovskite heterojunction based on CsPbI 3 NCs and its performance in solar cells. The guanidinium (GA + ) rich 2D nanoshells can significantly passivate surface trap states and lower the capping ligand density, resulting in improved photoelectric properties and carrier transport and diminished nonradiative recombination centers via the hydrogen bonds from amino groups in GA + ions. Consequently, an outstanding power conversion efficiency (PCE) of up to 15.53% is realized, substantially higher than the control device (13.77%). This work highlights the importance of surface chemistry and offers a feasible avenue to achieve high-performance perovskite NCs-based optoelectronic devices.
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Wenji Zhan,Haifei Wang,Jiahao Guo,Yugang Liang,Yanming Wang,Jixin Wu,Zhengzheng Dang,Ni Zhang,Jingjing Cao,Yingping Fan,Yu Zou,Bowei Li,Yao Wang,Yuetian Chen,Yanfeng Miao,Yixin Zhao
Deep-red light-emitting diodes (LEDs) with 690−710 nm emission show high significance in optical, agricultural, and biomedical applications. As primary candidates for deep-red emitters, all-inorganic CsPbI 3 films suffer from fused large grains with abundant trap states, leading to inferior performance of deep-red perovskite LEDs (PeLEDs). Here we report CsPbI 3 nanocrystal films with strong space confinement and notable performance at ∼700 nm of deep-red emission via bulk fabrication. The dual roles of diaza-18-crown-6 dihydriodide additive as crystallization regulator and Lewis base ligand trigger more nucleation sites, retarded grain growth and passivated trap states, ensuring the crystallization of high-quality space-confined CsPbI 3 nanocrystal films. This approach establishes a record-high external quantum efficiency (EQE) of 23.4% for deep-red PeLEDs, and achieves a maximum luminance of 10152 cd m −2 . Low roll-off is also demonstrated that EQE maintain over 20% under a high current density of 900 mA cm −2 , which is superior to state-of-the-art deep-red organic and quantum-dot LEDs. The T 50 operating lifetime is estimated to be 234 h at an initial radiance of 6.3 W sr −1 m −2 . This work provides an effectual strategy to accelerate radiative recombination and enhance the performance of CsPbI 3 -based deep-red PeLEDs.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
钙钛矿发光二极管
✓ 已验证
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Xueying Chen,Yeqing Chen,Jie Huang,Chen Li,Zongming Ni,Kang Zhang,Mingxuan Cao,Ting Yu,Yan Chen,Xin He,Yang Li
Cubic-phase CsPbI3 perovskite nanocrystals (CsPbI3 NCs) are widely used as a promising luminescent material in optical devices such as light-emitting diodes and lasers due to their high photoluminescence quantum efficiency and excellent color purities. However, the CsPbI3 lattice is more likely to face the problem of phase transformation due to the poor thermodynamic stability, which would lead to the decrease of its photoluminescence quantum efficiency. In this work, α-CsPbI3 NCs were synthesized by the room-temperature dual-ligand-assisted re-precipitation method under the synergistic effect of n-octanoic acid (OTAC), oleylamine (OLA), and (3-aminopropyl)triethoxysilane (APTES). The anionic OTAC and cationic OLA ligands interacted with the Pb2+ and I–, respectively, on the surface of the α-CsPbI3 NCs to passivate the defects on the surface. By the adjustment to the volume ratio of the OTAC to OLA, the synergistic effects of the dual ligands inhibited the distortion of the octahedral [PbI6]4– and maintained the cubic perovskite structure of the α-CsPbI3 NCs. The hydrolysis of APTES into the silica layer would provide efficient environmental protection and maintain the cubic phase of α-CsPbI3 at room temperature. The α-CsPbI3 NCs not only produce strong red emission upon the UV excitation but also exhibit strong up-conversion luminescent properties upon the near-infrared excitation at a low excitation power laser of 1064 nm, showing dual-mode luminescent characteristics as a promising material for potential applications in optical devices.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Tiantian Wang,Xiansheng Li,Tao Fang,Shalong Wang,Jizhong Song
Cesium lead iodide (CsPbI 3 ) perovskite nanocrystals (NCs) have received widespread attention in light-emitting diodes (LEDs), solar cells, and photodetectors (PDs) for their high thermal stability resulting from all-inorganic components. However, the facile room-temperature synthesis of perovskite-phase CsPbI 3 NCs remains a major challenge because of the thermal unequilibrium-induced metastable (black) to stable (yellow) phase transition. Here, we proposed a ligand-mediated strategy to synthesize γ-phase CsPbI 3 perovskite NCs in non-polar solvent at room temperature for the first time. We found that the introduction of 4-dodecylben-zenesulfonic acid (DBSA) ligand could prevent CsPbI 3 changing from the γ phase to the δ phase, which was attributed to the strong bonding and steric hindrance that suppressed the distortion of the corner-sharing octahedron . The as-synthesized CsPbI 3 perovskite NCs were well-dispersed in organic solvents (such as toluene and hexane), which could serve as inks to construct the active layer for solution-processed optoelectronic devices (The PD with an on/off ratio of 200, and the LED showing an external quantum efficiency (EQE) approaching 6%). The proposed method showed superior universality as evidenced by the successful synthesis of efficient red-greenblue CsPbX 3 NCs (the EQEs were 8.6%, 14.7%, and 3.4% for red, green, and blue LEDs, respectively). The results demonstrated that the room-temperature synthesis could avoid the tediousness of typical hot-injection at high temperatures and this method could be widely applied to various optoelectronic devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）