ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Wei Shen,Ye Yu,Wenzhu Zhang,Yanfeng Chen,Jianbin Zhang,Liu Yang,Jingting Feng,Gang Cheng,Lihui Liu,Shufen Chen
Exploitation of next-generation blue light-emitting diodes (LEDs) is the foundation of the revolution in lighting and display devices. Development of high-performance blue perovskite LEDs is still challenging. Herein, 4-aminobenzenesulfonic acid (SA) is introduced to passivate blue CsPbBr3 nanoplates (NPLs), reducing the ionic migration via a more stable Pb2+–SO3–– formation, and the trap state density of films shows a 50% reduction. The inevitable Br– vacancy defects after the multistep washing process can be suppressed by a suitable MABr treatment, which can boost the external quantum efficiency (EQE) performance. It should be noted that the coverage of NPL films is another key factor to realize reproducible pure blue electroluminescence (EL). Therefore, we proposed an alternate droplet/spin coating method to improve the coverage and thickness of NPL layer to prevent hole transport layer emission and increase the reproducibility of LED performance and spectra. Furthermore, we designed hole transport layers to decrease the hole transport barrier and improve the energy-level alignment. According to SA passivation, MABr treatment, alternate droplet/spin coating method, and device structure optimization, a CsPbBr3 NPL-based pure blue (0.138, 0.046) LED with 3.18% maximum EQE can be achieved, and the half-lifetime of EL can be enhanced 1.71 times as compared to that of the counterpart LED without SA. Both performance and stability of pure blue NPL LEDs can be greatly improved via ligand passivation, alternate droplet/spin coating method, and device structure optimization, which is a trend to promote the development of pure blue perovskite LEDs in future.
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高影响因子
Nano Energy
·
2021
·
IF 17.881
Tao Huang,Hui Peng,Qilin Wei,Chengyu Peng,Ye Tian,Shangfei Yao,Xinxin Han,Bingsuo Zou
If we introduce transition metal ions with spins into an organic-inorganic halide perovskite compounds, interesting spin dependent optical properties may be seen in this system. This paper reports an organic-inorganic hybrid manganese ion doped lead halide crystal incorporated by TDMP (trans-2,5-dimethylpiperazinium), it gives not only the STE1 (polaronic exciton), usually brought up by the enhanced electron-phonon coupling in the amine incorporated compound, but also give a novel bipolaronic exciton (STE2) for the paired charge state formation due to the incorporation of bi-amine cationic molecules, a excitation by the polaronic molecule due to enhanced electron-phonon coupling and neighboring correlation out of the Mn ion ferromagnetic spin coupling in the lattice at slightly high doping. Such magnetic bipolaron state could often be accompanied by several multiphonon Raman modes and ferromagnetism. It is even interesting that this state can give super-high red emission with PLQY at ~92.5% at room temperature. Moreover, the emission color and intensity could also be modulated by the Mn doping concentration, temperature, and laser excitation power. The low doping products can give green emission out of single Mn d-d transition at very low temperature or high laser excitation power. The intermediately doped products can give white emission out of STE1 and STE2. The highly doping products give red emission out of STE2 (bipolaron states) at room temperature or low laser power. These interesting phenomena reflected the microscopic interactions between spins, carriers and phonons in the products, which can be found applications in the future fields of photonics and spintronics.
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Chemical Science
·
2023
·Vol. 14
·期 33
·8914-8923
·
IF 8.4
Keqiang Chen,Zixin Gu,Zhiqing Wang,Mengyu Guan,Xiu Tan,Wanqing Xu,Xinyu Ji,Weiqi Lu,Yueli Liu,Guogang Li
Recently, the polarization effect has been receiving tremendous attention, as it can result in improved stability and charge transfer efficiency of metal-halide perovskites (MHPs). However, realizing the polarization effect on CsPbX3 NCs still remains a challenge. Here, metal ions with small radii (such as Mg2+, Li+, Ni2+, etc.) are introduced on the surface of CsPbX3 NCs, which facilitate the arising of electric dipole and surface polarization. The surface polarization effect promotes redistribution of the surface electron density, leading to reinforced surface ligand bonding, reduced surface defects, near unity photoluminescence quantum yields (PLQYs), and enhanced stability. Moreover, further introduction of hydroiodic acid results in the in situ formation of tert-butyl iodide (TBI), which facilitates the successful synthesis of pure iodine-based CsPbI3 NCs with high PLQY (95.3%) and stability under ambient conditions. The results of this work provide sufficient evidence to exhibit the crucial role of the surface polarization effect, which promotes the synthesis of high-quality MHPs and their applications in the fields of optoelectronic devices.
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高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Hao-Ran Chen,Min Wan,Zi-Mu Li,Wen-He Zhong,Si-Yu Ye,Qiang-Qiang Jia,Jun-Yi Li,Li-Zhuang Chen
Molecular ferroelectric materials are widely applied in piezoelectric converters, non-volatile memorizers, and photovoltaic devices due to their advantages of adjustable structure, lightweight, easy processing, and environmental friendliness. However, designing multifunctional molecular ferroelectrics with excellent properties has always been a great challenge. Herein, a multiaxial molecular ferroelectric is successfully designed by modifying the quasi-spherical cation dabco with CuBr2 to obtain halogenated [Bretdabco]CuBr4 (Bretdabco = N-bromoethyl-N′-diazabicyclo [2.2.2]octane), which crystallizes in polar point groups (C6). Typical ferroelectric behaviors featured by the P–E hysteresis loop and switched ferroelectric domain are exhibited. Notably, the molecular ferroelectric shows a high TC of 460 K, which is rare in the field and could greatly expand the application range of this material. In addition, the band gap is adjustable through the regulation of halogen. Both the UV absorption spectra and theoretical calculations indicate that the molecular ferroelectrics belong to a direct band gap (2.14 eV) semiconductor. This tunable and narrow band gap semiconductor molecular ferroelectric material with high TC can be utilized more effectively in the study of optoelectronics and sensors, including piezoelectric energy harvesters. This research may provide a promising approach for the development of multiaxial molecular ferroelectrics with a tiny band gap and high TC.
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高影响因子
CHEMISTRY OF MATERIALS
·
2023
·
IF 8.6
Dong-Yang Li,Jia-Hang Wu,Xing-Yu Wang,Xiao-Yang Zhang,Cheng-Yang Yue,Xiao-Wu Lei
Multifunctional stimuli-responsive luminescent and optical switching is extremely crucial for wide advanced photonic applications, but it remains a challenging objective for halide perovskites. Herein, by performing single-crystal to single-crystal (SC–SC) transformation as a dynamic molecular strategy, we realized a reversible triple-mode photoluminescence, radioluminescence (PL and RL), and nonlinear optical (NLO) switching in a pair of zero-dimensional (0D) hybrid cuprous halides of [ETPP]2Cu4Br6 and [ETPP]CuBr2. Specifically, [ETPP]2Cu4Br6 and [ETPP]CuBr2 display highly efficient yellow and green light emissions under UV light excitation with the highest quantum yield of up to near unity. Simultaneously, identical radioluminescence can also be activated by using X-ray as RL with a light yield of up to 57,974 photons MeV–1, surpassing most of the previously reported hybrid cuprous halides. Most remarkably, reversible SC–SC transformation between them can be realized in an ethanol impregnation-heating process, which provides reversible PL/RL transitions in two light-emitting states. Additionally, this process is also accompanied by transition between the centrosymmetric NLO-inactive [ETPP]2Cu4Br6 and noncentrosymmetric NLO-active [ETPP]CuBr2 through reversible second harmonic generation (SHG) “silent-active” switching. To the best of our knowledge, this is the first reported triple-mode reversible PL, RL, and SHG switching in halide perovskite chemistry, which can realize advanced applications in data storage, information security, optical logic gates, etc.
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Advanced Energy Materials
·
2023
·Vol. 13
·期 23
·2204335
·
IF 27.8
Ziwei Zheng,Minghao Xia,Xiayan Chen,Xuan Xiao,Jinwei Gong,Jiale Liu,Jiankang Du,Yiran Tao,Yue Hu,Anyi Mei,Xinhui Lu,Hongwei Han
The low cost and scalability advantages of printable mesoscopic perovskite solar cells (p-MPSCs) are impaired by the issue of limited power conversion efficiency (PCE). Herein, the PCE of p-MPSCs is improved by introducing the polymer additive polyacrylonitrile (PAN) into the formamidinium (FA)-based perovskite for crystallization and defect modulation. PAN forms hydrogen bond and coordination bond with halide perovskite through its C≡N group. Such interactions improve the crystallization and filling of FA-based perovskite in the mesoscopic scaffold and bring a long carrier lifetime by passivating defects. The synergy improves the PCE of p-MPSCs from 16.80% to 18.33%. Meanwhile, the hydrophobic nature of PAN enhances the device's resistance against moisture. This work demonstrates that the polymer additive is a promising choice for breaking the PCE limit of p-MPSCs.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2023
·Vol. 29
·期 40
·e202300667
·
IF 4.3
Peng Xu,Huang Ye,Yunpeng Yao,Tingting Zhu,Junhua Luo
Graphical Multifunctional material (benzylammonium) 4 AgBiBr 8 , which has a step-like dielectric phase transition at 383 K/387 K (cooling/heating) and excellent photoelectric properties, was obtained by using rigid benzylammonium cations as templates. Layered hybrid perovskites possess exceptional semiconductor features and structural versality, making them viable candidates for developing multifunctional dielectric phase-transition materials (PTMS). However, most PTMs based on layered hybrid perovskites still suffer from Pb toxicity and low operating temperature. The recently developed hybrid double perovskites provide a new routine to designed PTMs with desired working performance and environment-friendly chemical compositions. Herein, using rigid aromatic cations as templates, we have successfully synthesized a novel double perovskite (benzylammonium) 4 AgBiBr 8 ( 1 ), which consists of corner-sharing AgBr 6 and BiBr 6 layers and benzylammonium cations. Notably, 1 exhibits a high-temperature first-order reversible solid-state phase transition at 383/387 K (cooling/heating) and switchable dielectric performance around the temperature. Compared with the soft organic chain version of the compound, the phase transition temperature of 1 shows a large enhancement of 99 K, validating the correctness of the designing strategy. In addition, 1 also exhibits semiconductor characteristics with a calculated bandgap of 2.34 eV and an optical bandgap of 2.29 eV. Remarkably, the single crystal photodetector of 1 shows a low dark current (2.12×10 −13 A), a high on/off ratio (1.77×10 3 ), and a fast response ( τ rise =125 μs and τ decay =419 μs). Such a lead-free phase transition material combined with semiconductor properties provides a new strategy to develop environmentally friendly multifunctional materials.
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OPTICAL MATERIALS
·
2021
·
IF 3.08
Jiao Xun,Jidong Deng,Wei Shen,Ming Li,Rongxing He
Although organic-inorganic hybrid MAPbBr 3 (CH 3 NH 3 + = MA) perovskite nanocrystals (NCs) have outstanding optical properties , their toxicity and the low thermal stability seriously hinder the further application. Herein, the low-toxic MAPb 1- x Mn x Br 3 NCs were synthesized by the modified ligand-assisted re-precipitation (LARP) approach at room temperature. The mixed-metal NCs exhibit high PLQYs (more than 93%) due to a certain amount of Mn 2+ doping effectively inhibits the non-radiative recombination, and thus improves the optical performance. The as-synthesized perovskite NCs also show excellent thermal stability because of the elimination of structural distortion by Mn 2+ -doping. The fast anion exchange of Mn 2+ -doped perovskite NCs effectively extends their photoluminescence to the whole visible spectral region. Interestingly, a novel dual-emission was observed in MAPb 1- x Mn x (I/Br) 3 ( x = 0.3) perovskite NCs due to the phase separation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yun Tang,Xiaoqiang He,Yuchao Zhang,Hudie Yuan,Yalou Xin,Xiaohu Ren,Qiang Chen,Hongfeng Yin
Widespread application of YAG:Ce-based white light-emitting diodes (WLEDs) is being challenged for their poor color rendering index (CRI) and high correlated color temperature (CCT) due to the lack of red emission. Organic-inorganic hybrid perovskite nanocrystals (MAPbX 3 PNCs, X = Cl, Br, I or mixture of them), presenting high photoluminescence quantum yield, tunable emission color and simple fabrication process have been recognized as promising red-emitting component for warm WLEDs. However, additional protection process for PNCs always needed due to their poor stability, which complicates the fabrication procedures of WLEDs. Besides, nano-sized PNCs and micron YAG:Ce powder display different sinking behavior in silicone , which also hard to ensure the uniform distribution of the two components and subsequently stable optical characteristics of the device. Herein, a one-pot anchoring strategy is implemented to realize the enhanced thermal and photo-stabilities of in-situ generated red-emitting MAPbBr 0.5 I 2.5 PNCs and simultaneously strong interaction between the PNCs and YAG:Ce to form PNCs@A-YAG composite, which greatly simplifies the processes, and also avoids the uneven distribution of phosphor and PNCs in silicone . Furthermore, the WLED, fabricated by PNCs@A-YAG and a commercial blue chip, exhibits high CRI of 92, low CCT of 4755 K, and super high saturated red color R9 of 95, which are of vital importance in achieving warm white light for indoor lighting applications. This work could promote the practical application of perovskite nanocrystals in the field of high color rendering index WLEDs.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Wei-Feng Zhang,Hong-Mei Pan,Yue-Yu Ma,Dong-Yang Li,Zhihong Jing
In recent years, organic-inorganic hybrid lead halide perovskites have emerged as a highly promising class of light emitting diodes (LEDs) due to their diverse structures and promising properties. Herein, by choosing various organic molecules as cations, we successfully constructed a series of 1D perovskites of [PMDETA]PbBr 5 , [PMDETA]PbCl 5 , [DMPZ][MA]PbBr 5 , [EEDA][MA]PbCl 5 , [EPZ][MA]PbCl 5 and [EPZ] 3 Pb 2 Br 10 . Under the different structural directing effects of organic cations, these 1D perovskites feature three different kinds of linear or zigzag 1D [PbX 5 ] 3− chains based on purely corner-shared octahedrons. As expected, these 1D perovskites exhibit tunable broadband light emissions from blue to yellow spectral range stemming from the self-trapped excitons based on systematical characterizations including time-resolved, temperature-dependent PL emissions and theoretical calculations. This work provides crystal structural engineering for low-dimensional perovskites and paves a new way to regulate the luminescent properties.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 12
·2109891
·
IF 18.808
Ganghong Liu,Zehao Zhang,Cuncun Wu,Yuqing Zhang,Xiangdong Li,Wenjin Yu,Guangjie Yao,Shiming Liu,Jun-jie Shi,Kaihui Liu,Zhijian Chen,Lixin Xiao,Bo Qu
The toxicity of lead-based halide perovskites hampers broad application in optoelectronics. Lead-free perovskite Cs 2 AgBiBr 6 is considered a promising candidate, owing to the long carrier lifetime and great stability. However, the relatively large bandgap of 1.98 eV limits its absorption in the visible region. Herein, Fe 2+ is chosen as the dopant to alloy into Cs 2 AgBiBr 6 single crystals, and results in an absorption range broadening to ≈1350 nm, which is the longest near-infrared (NIR) response recorded among lead-free perovskites. About 1% of Fe ions are alloyed into the Cs 2 AgBiBr 6 lattice to cause lattice shrink age. Instead of narrowing the bandgap, Fe doping would introduce a new intermediate band inside the pristine bandgap of Cs 2 AgBiBr 6 to strongly absorb NIR light, as confirmed by third harmonic generation results. Moreover, considerable photogenerated carriers are produced in Fe doped Cs 2 AgBiBr 6 crystals with NIR irradiation. This work has provided a new way to extend the optical response of lead-free perovskites for NIR photodetectors and intermediate band photovoltaics.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 8
·2105164
·
IF 18.808
Weigang Ding,Hongli Liu,Shuai Zhang,Dingding Qiu,Xianggao Li,Shirong Wang
Perovskite films have emerged as candidates for light-emitting diodes on accounts of excellent optical properties and low cost. Construction of quasi-2D perovskite films by incorporating organic ammonium is an effective method to manufacture a pinhole-free film with high photoluminescence quantum yield (PLQY). However, excess organic ammonium hampers carrier mobility through forming insulating capping layer and facilitates the formation of alow-dimensional perovskite ( n = 1 and n = 2) phase that accelerates non-radiative recombination, resulting in poor performance of light-emitting diodes. In this work, formamidine acetate is added into the quasi-2D perovskite to modulate the optical and electrical properties of the perovskite films (CsFA-Ac). Acetate ions are in favor of washing away excess ammonium and formamidine ions are beneficial to increase the formation energy of low-dimensional ( n = 2) phase. As a result, the quasi-2D perovskite is transformed into 3D perovskite. The PLQY of the obtained CsFA-Ac perovskite films is boosted to 59.9% and carrier mobility is enhanced to 47.3 cm 2 V -1 s -1 . Blue perovskite light-emitting diode based on the CsFA-Ac film is endowed with a prominent EQE of 8.8% (average 7.0%) at 477 nm. This work demonstrates a strategy for the development of efficient perovskite light-emitting diodes.
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