Flexible perovskite light-emitting diodes for display applications and beyond

The flexible perovskite light-emitting diodes(FPeLEDs),which can be expediently integrated to portable and wearable devices,have shown great potential in various applications.The FPeLEDs inherit the unique optical properties of metal halide perovskites,such as tunable bandgap,narrow emission linewidth,high photoluminescence quantum yield,and particularly,the soft nature of lattice.At present,substantial efforts have been made for FPeLEDs with encouraging external quantum efficiency(EQE)of 24.5%.Herein,we summarize the recent progress in FPeLEDs,focusing on the strategy developed for perovskite emission layers and flexible electrodes to facilitate the optoelectrical and mechanical performance.In addition,we present relevant applications of FPeLEDs in displays and beyond.Finally,perspective toward the future development and applications of flexible PeLEDs are also discussed.

SMART/ASTC dynamic soft reduction technology and its application on the bloom continuous caster at Pangang

The SMART/ASTC dynamic soft reduction technology of VAI and its application on the 6-strand bloom continuous caster at Pangang, China are presented. The operation results show that soft reduction technology is effective to improve the inner quality of continuously cast blooms. At Pangang, both the central porosity and the central segregation ratings are no more than 1.0, the central shrinkage cavity rating is no more than 0.5, and the central segregation index of carbon is no more than 1.05. Rails made from the blooms have excellent quality and are used for high-speed tracks.

Direct synthesis of L10-FePt nanopartides from single-source bimetallic complex and their electrocatalytic applications in oxygen reduction and hydrogen evolution reactions

L10-FePt nan oparticles(NPs)with high chemical ordering represent effective electrocatalysts to reduce the cost and enhance theircatalytic performanee in fuel cells.A molecular strategy of preparing highly ordered FePt NPs was used by direct pyrolysis of a Fe,Pt-containing bimetallic complex.The resultant L10-FePt NPs had very high crystallinity as reflected by the obvious diffractionpatterns,clear lattice fringes and characteristic X-ray diffraction peaks,etc.Besides,the strong ferromagnetism with room temperaturecoercivity of 27 kOe further confirmed the face-centered tetrag on al(fet)phase in good agreement with the ordered nano structures.TheFePt NPs can be used as electrocatalysts to catalyze oxygen reduction reaction(ORR)in an O2·saturated 0.1 M HClO4 solution andhydrogen evolution reaction(HER)in the 0.5 M H2SO4 electrolyte with much better performance than commercial Pt/C,and showedquite high stability after 10,000 cycles.The strategy utilizing orga no metallic precursors to prepare metal alloy NPs was dem on strated tobe a reliable approach for improving the catalytic efficiency in fuel cells.

定量核磁共振氢谱法对徐长卿中丹皮酚含量的快速提取和含量测定

徐长卿是一种治疗多种疾病的中药材。丹皮酚是徐长卿的主要活性成分,也是质量控制的关键指标物。本文以核磁共振氢谱建立了一种徐长卿中丹皮酚含量的快速、准确、精密的检测方法。结果表明,氘代甲醇作溶剂可以很好的实现核磁共振氢谱中信号的分离,H-6 (δ7.78)可用作定量分析特征信号,均苯三甲酸用作内标。所建立的方法经线性范围、专属性、重复性和稳定性进行了确证。本文首次采用定量核磁共振氢谱检测徐长卿中丹皮酚的含量,线性范围较其他药材中丹皮酚的含量检测更宽。采用单次提取方式对丹皮酚进行提取,方法快速,更利于应用于质量控制中。本文研究表明相对现有基于高效液相色谱检测方法,定量核磁共振氢谱法是一种适合徐长卿质量控制可行的替代方法。

半竹节虫型双金属配合物制备铁铂纳米颗粒及其图案化阵列的磁存储应用（英文）

L1_0相铁铂合金纳米颗粒具有较高的磁矫顽力,其图案化阵列有望用于开发下一代磁性数据记录系统,但是单分散铁铂纳米颗粒的合成及大规模制备图案化阵列的制备仍是巨大的挑战.本文合成了一种含有铁铂的双金属配合物,配合物由刚性的共平面金属中心和柔性尾链形成半竹节虫型结构,这种特殊的分子结构有利于机械加工中分子有序排列.配合物用作单源前驱体经一步热解即可制备L1_0相铁铂合金纳米颗粒.另外,借助高效的纳米印刷技术,对配合物溶液进行压印即可制备大规模高度有序的图案化阵列,所得阵列在氩氢混合气保护下原位热解,形成规则的磁性阵列,表明这种方式制备的磁性图案可用于磁数据存储设备.