OPTICS AND LASER TECHNOLOGY
·
2020
·
IF 3.233
Kai Xu,Dongliang Li,Yongfang Yuan,Jiwen Xu,Hua Wang,Lihui Wang,Zongliu Lu,Liming Liu,Zhidong Lin,Xiaowen Zhang
Electron injection governs electro-optic performance of organic light-emitting diodes (OLEDs) with intractable inverted architecture. Solution process with low cost and scalable manufacturing drives a lab-to-fab journey of electron injection layer (EIL) in OLEDs. Herein, a facilely solution-processed composite EIL of ZnO + Cs 2 CO 3 with robust electron injection has been explored for constructing ultraviolet OLED with inverted architecture. Using 3-(4-biphenyl)-4-phenyl-5- tert -butylphenyl-1,2,4-triazole as emitter, attractive short-wavelength emission of 380 nm and full-width at half-maximum of 37 nm are demonstrated in the inverted ultraviolet OLED. It achieves maximum radiance of 2.42 mW/cm 2 and external quantum efficiency of 0.85% with improved operation durability, which are superior or comparable to the corresponding references using single EILs of Cs 2 CO 3 , ZnO and LiF, or double-stacked EIL of ZnO/Cs 2 CO 3 . X-ray photoelectron spectroscopy analysis clarifies that the Cs 2 CO 3 , ZnO and ZnO + Cs 2 CO 3 exhibit exceptional electronic properties. The current-voltage characteristics and impedance spectroscopy analysis of electron-only cells confirm that ZnO + Cs 2 CO 3 behaves robust electron injection and accounts for excellent device performance. Our results pave an alternative approach for advancing ultraviolet OLED with inverted architecture and facile solution process.
研究领域:
材料科学
·
光电工程
✓ 已验证
DOI
高影响因子
TETRAHEDRON LETTERS
·
2020
·
IF 2.275
Haibo Zhu,Yingying Zhang,Yishuai Liu,Liu Yang,Zongbo Xie,Guofang Jiang,Zhang-Gao Le
A practical and efficient approach adopting transition-metal-free cross-coupling of sulfonyl hydrazides with benzyl ammonium salts has been developed to synthesize benzyl sulfones using Cs 2 CO 3 as base under mild conditions. The protocol employs stable and easy to handle coupling partners, and is endowed with good substrate compatibility, leading to functional benzyl sulfones in good yields.
研究领域:
有机化学
·
合成化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2019
·Vol. 7
·期 1
·1901952
·
IF 15.804
En-Chi Shen,Jing-De Chen,Yu Tian,Yu-Xin Luo,Yang Shen,Qi Sun,Teng-Yu Jin,Guo-Zheng Shi,Yan-Qing Li,Jian-Xin Tang
Inorganic mixed-halide CsPbX 3 -based perovskite solar cells (PeSCs) are emerging as one of the most promising types of PeSCs on account of their thermostability compared to organic–inorganic hybrid counterparts. However, dissatisfactory device performance and high processing temperature impede their development for viable applications. Herein, a facile route is presented for tuning the energy levels and electrical properties of sol–gel-derived ZnO electron transport material (ETM) via the doping of a classical alkali metal carbonate Cs 2 CO 3 . Compared to bare ZnO, Cs 2 CO 3 -doped ZnO possesses more favorable interface energetics in contact with the CsPbI 2 Br perovskite layer, which can reduce the ohmic loss to a negligible level. The optimized PeSCs achieve an improved open-circuit voltage of 1.28 V, together with an increase in fill factor and short-circuit current. The optimized power conversion efficiencies of 16.42% and 14.82% are realized on rigid glass substrate and flexible plastic substrate, respectively. A high thermostability can be simultaneously obtained via defect passivation at the Cs 2 CO 3 -doped ZnO/CsPbI 2 Br interface, and 81% of the initial efficiency is retained after aging for 200 h at 85 °C.
研究领域:
材料科学
·
能源技术
·
光伏器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2026
·
IF 2.4
Jia Xu,Xun Wang,Tongqing Wang,Ziwei Hu,Ruyi Lin,Dan Li,Yong Ma,Lingzong Meng,Yafei Guo,Guangli Zhou,Tianlong Deng
The isopiestic equilibria in the system Na2CO3–Cs2CO3–H2O at 308.15 K were investigated with an improved isopiestic method with a modified gravimetric isopiestic apparatus. The water activities and osmotic coefficients were determined based on the calcium chloride standard reference solution. The equilibrium vapor pressure was calculated with the water activity. Combining the Pitzer binary parameters of Na2CO3, the Pitzer binary parameters β(0), β(1), and Cφ of Cs2CO3 and Pitzer mixing parameters θNa+, Cs+ and ψNa+, Cs+, CO32– were fitted with the experimental osmotic coefficients on the basis of the Pitzer model. The water activities were then calculated by the Pitzer parameters, and the good agreement between the calculated water activities and experimental results of this ternary system indicated that the Pitzer parameters obtained in this work were reliable. The thermodynamic data and Pitzer parameters obtained in this work can provide fundamental thermodynamic data for development of universal chemical models for brine systems containing cesium carbonate.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING COMMUNICATIONS
·
2026
·
IF 2.2
Ijaz Ul Haq,Nawab Ali,Weihua Shen,Yunjin Fang
The sustainable synthesis of poly (propylene carbonate) (PPC) from CO2 and propylene oxide (PO) was investigated using a combined computational and experimental approach under cesium carbonate/triethylboron (Cs2CO3/Et3B) catalysis. Conventional high-temperature (40–80 °C) ring-opening copolymerization (ROCOP) typically suffers from low selectivity, limited CO2 incorporation, broad dispersity (Đ), and reduced average molecular weights (Mn). In contrast, the (Cs2CO3/Et3B) catalyst system demonstrated significantly improved performance at lower temperatures, enabling efficient PPC formation. Furthermore, the incorporation of the phase-transfer catalyst tetrabutylammonium bromide (TBAB) enhanced CO2 solubility in PO, thereby increasing copolymerization efficiency. Temperature played a critical role in dictating reactivity: at 35 °C, the [(Cs2CO3/TBAB) Et3B] system outperformed (Cs2CO3/Et3B) alone, yielding higher selectivity, increased Mn, and narrower Đ. At 70 °C, however, the reaction shifted entirely toward the entropically favored backbiting cyclization, resulting in >99% propylene carbonate (PC). Overall, computational and experimental studies establish the [(Cs2CO3/TBAB) Et3B] catalyst system as a highly active and versatile platform for efficient and tunable ROCOP.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）