ACS Applied Materials & Interfaces
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2022
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IF 10.383
Dongyang Shen,Zhenwei Ren,Qinyi Li,Chengzhao Luo,Wenlin Xia,Zhishuai Zheng,Wenchen Ma,Jie Li,Yu Chen
Quasi-two-dimensional (quasi-2D) perovskite has exhibited great potential to be an ideal luminescent material for perovskite light-emitting diodes (PeLEDs). However, the low-order phases (especially n = 1 phase) and the inevitable defects result in massive nonradiative recombination and poor emission efficiency. Herein, a multifunctional molecule of tetrabutylammonium dihydrogen phosphate (TDP) is introduced to simultaneously suppress the low-n phase, passivate the defects, and increase the exciton binding energy of the quasi-2D perovskite for massive radiative recombination and thus high emission efficiency. The multifunctional roles of TDP are realized by the synergistic effects of tetrabutylammonium cation and dihydrogen phosphate anion, both of which show strong interaction with the lead bromide octahedron of the perovskite. As a result, the TDP-incorporated perovskite films show a great enhancement of the emission efficiency with a remarkable increase in photoluminescence quantum yield (PLQY) from 34.6 to 96.9% at the wavelength of 522 nm. The strengthened radiative recombination promotes efficient emission efficiency with over 2.5-fold improvement in external quantum efficiency (EQE) and current efficiency (CE) from 3.27% and 10.83 cd A–1 to 9.25% and 28.35 cd A–1, respectively, as well as high brightness with over 37% enhancement from 12713 to 17536 cd m–2. Consequently, this work contributes to an efficient approach to employ a multifunctional molecule for highly emissive quasi-2D perovskites and enhanced quasi-2D PeLED performances.
研究领域:
材料科学
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光电
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半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
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2021
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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.
研究领域:
材料科学
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光电
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自旋电子学
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光子学
✓ 已验证
产品关联
DOI
高影响因子
Small
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2022
·Vol. 18
·期 19
·2200740
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IF 15.153
Yuhao Geng,Jiazhuang Guo,Huiqing Wang,Si Da Ling,Zhuo Chen,Su Chen,Jianhong Xu
Cesium lead halide perovskite nanocrystals (CLHP NCs) have a wide range of potential applications benefited from the properties of high photoluminescence quantum yield (PLQY), wide luminous gamut, and narrow half peak width. However, due to the ionic nature and sensitivity to moisture, oxygen, or heat, perovskite nanocrystals are too fragile to maintain their crystal structure and optical properties. This work proposes solutions to two key issues in the development of CLHP NCs. First, a productive droplet-based microreactor system is designed to accomplish the scale-up production of CLHP NCs, obtaining sub-gram high-purity nanocrystal powders in a single production process. Second, CLHP NCs which are stable in polar solvents, air environment, and high temperature by using 3-aminopropyl triethoxysilane (APTES) as basic ligand are obtained. Wrapped with Si–O–Si generated by APTES, the CLHP NCs exhibit a longer fluorescence lifetime and higher quantum yield. Especially, the PLQY of CsPbBr 3 @APTES can be stable at higher than 90% for more than 10 days. The Si–O–Si protective layer can also suppress the anion exchange between CsPbBr 3 and CsPbI 3 , maintaining the monochromaticity of nanocrystal luminescence. Eventually, full-spectrum quantum light-emitting diode (QLED) beads with robust nanocrystals are fabricated. The gamut of CsPbX 3 @APTES encompasses 140% of the NTSC color gamut standard.
研究领域:
材料科学
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纳米技术
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光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Materials Today
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2022
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IF 8.663
Xikang Yang,Anlang Wu,Zhiqiang Deng,Zhihai Wu,Zhenfu Zhao,Ziyang Hu
Perovskite quantum dots (PeQDs) are emerging as one of the most promising candidates for next-generation display technology due to their outstanding optical and electrical properties. However, the inherent instability, lead-toxicity and poor electrical conductivity of PeQDs films have seriously hindered their commercial applications. To solve these problems, we adopted the strategy of Zr ions doping and in-situ passivation of CsPbBr 3 PeQDs with the short-chain inorganic ligand potassium thiocyanate (KSCN), which not only enhanced the stability and boosted the photoluminescence quantum yield (PLQY) of PeQDs films, but also improved their electrical conductivity. To further solve the problem of charge injection balance and improve the operating lifetime of the devices, we simultaneously used all-inorganic metal oxide semiconductor materials Mg-doped ZnO (Mg-ZnO) and Mg-doped NiO x (Mg-NiO x ) as the electron and hole transport layers of QLEDs (ETL and HTL), respectively. The operating stability of the devices was greatly improved while being able to withstand higher current densities. Therefore, using Zr-doped and KSCN passivated CsPbBr 3 (Zr doped CsPbBr 3 -KSCN) PeQDs as the light-emitting layer, we fabricated highly efficient and stable green-light all-inorganic quantum dots light-emitting diodes (QLEDs) with the maximum external quantum efficiency (EQE) of 13.8% and the maximum brightness of 24800 cd/m 2 . These green perovskite QLEDs provide a working half-life of 360 min (initial brightness is 1000 cd/m 2 ) and the operating half-life of the devices is more than two times higher than that of the reference devices. Our proposed strategy based on doping and in-situ inorganic ligand passivation will open a new avenue for fabricating efficient, stable and other colored perovskite QLEDs.
研究领域:
材料科学
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电气工程
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光电技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
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IF 5.7
Minghui Lu,Hui Peng,Qilin Wei,Shichao Zhou,Yongrun Dong,Shuiyue Yu,Jialong Zhao,xianci zhong,Bingsuo Zou
Recently, Sb3+-doped all-inorganic vacancy-ordered double perovskites A2SnCl6 (A = K, Rb, and Cs) have attracted wide attention because of their unique optoelectronic properties and excellent stability. However, Sb3+-doped A2SnCl6 generally exhibits poor emission intensity. To overcome this, we take the all-inorganic A2SnCl6 as the conformational model and utilize a universal supramolecular assembly strategy to develop three different organic metal halides with dumbbell structures of (KC)2SnCl6:Sb3+, (RbC)2SnCl6:Sb3+, and (CsC)2SnCl6:Sb3+ (C = 18-crown-6). Compared with Sb3+-doped A2SnCl6 shows poor emission intensity, Sb3+-doped (AC)2SnCl6 exhibits the efficient tunable white emission with photoluminescence quantum yield (PLQY) of 86.7% for (KC)2SnCl6:Sb3+, 81.6% for (RbC)2SnCl6:Sb3+, and 89.8% for (CsC)2SnCl6:Sb3+, which stems from Sb3+-induce Jahn-Teller-like singlet and triplet self-trapped excitons (STEs) emission. Particularly, there eruptive PLQY obtained in Sb3+-doped (AC)2SnCl6 can be attributed to the strong supramolecular interactions increasing the structural rigidity and thus inhibiting non-radiative transitions. Longer Sb-Sb distances in Sb3+-doped (AC)2SnCl6 facilitate the expression of Sb3+ 5s2 lone pairs. Moreover, Sb3+-doped (AC)2SnCl6 also has an excellent chemical- and photo-stabilities. Finally, taking Sb3+-doped (KC)2SnCl6 as an example, we further demonstrated its applications in single-compound white light-emitting diodes (WLED) at room temperature, multiple-mode optical anti-counterfeiting, and information encryption.
研究领域:
材料科学
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光电
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
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