离子注入机技术及在发光研究中的应用

近年来,随着我国科学技术的不断进步,新型技术层出不穷,尤其是离子注入机技术的发展,它的进步对我国发光研究产生了深远的影响。具体包括,稀土离子注入机技术形成稀土杂质发光,B、P、S等离子注入晶体、C、Ge离子注入Si或者Sio2发光等。本文针对离子注入机技术在我国发光研究中的现状以及存在的问题,进行深入的分析和探讨,从而提出几点有效的措施和建议,提高我国离子注入机技术在发光研究中的水平,促进我我国发光材料的发展。

化学发光免疫分析方法的研究及应用

本文根据各化学发光免疫分析方法所使用标记物质的不同,将化学发光免疫分析方法分为化学发光免疫分析、化学发光酶免疫分析和电化学发光免疫分析法,并对各方法经典标记物质及分析方法原理进行了分析。同时,介绍了化学发光免疫分析方法在医学检验、食品安全及环境科学方面的应用进展情况。

CeO_2:Eu^(3+)薄膜的制备及其发光性能研究

采用Pechini法制备Eu3+掺杂的CeO2:Eu3+薄膜.利用X射线衍射(XRD)﹑原子力显微镜(AFM)和光致荧光光谱(PL)对样品进行表征.结果表明:薄膜样品在700℃就结晶成纯面心立方萤石结构的多晶薄膜;PL激发谱中,300～360 nm的宽带激发峰起源于基质CeO2的吸收.

采用发光细菌研究探讨“十八反”配伍药物的临床毒性

历代对中药“十八反”配伍看法不一,近年来在动物实验和临床研究亦甚多,结果各抒己见。在此基础上我们运用了“明亮发光杆菌502测定”“十八反”药物的毒性,研究结果支持“十八反”配伍毒性并不增加,相反有些毒性有所降低的结论。

发光学的进展

从发光的定义及基本方式出发 ,论述了发光的重要理论基础 ,扼要介绍了微腔发光、量子阱及超晶格发光、多孔硅发光、纳米材料、上转换及量子剪裁现象、闪烁晶体中的交替发光机制、有机场致发光、蓝光及紫外光的获得、存储技术、灯用材料、平板显示及近场显微技术等方面的近期研究进展 。

New development on additive manufacturing technology and its applications

Additive manufacturing technology has been developed in Xi＇ an Jiaotong University for almost 20 years. Up to now~ it is still attracting the attentions of the researchers or manufacturers all over the world. Some in- novative processes and frontier application research are all being conducted here to catch up with the new develop- ment of this technology. In the paper, newly developed processes, such as ultraviolet-light emitting diode （UV- LED） stereolithography, ceramic stereolithography, and direct metal forming, were described. Some results of the frontier application researches, such as indirect fabrication of ceramic casting mould, wind-tunnel-testing models, photonic crystals and metamatcrials, were also briefly reviewed.

Preliminary Feasibility Study on Application of Very Large Scale-Photovoltaic Power Generation in China

Some energy experts believe that solar energy photovoltaic power generation is hopeful to be applied in a large amount and possesses a certain proportion in the structure of energy in the future. In this paper, based on the forecasting of electric load demand and energy structure of power generation in the middle of 21 century, the pictures of VLS-PV power genera- tion is composed, the operation characteristic of VLS-PV power generation and the adaptability of electric power grid for it is analyzed, the ways for transmitting large amount of PV power and the economic and technical bottlenecks for applying VLS-PV power generation are discussed. Finally, the steps and suggestions for developing VLS-PV power generation and its electric power system in China are proposed.

Boron-containing Thermally Activated Delayed Blue Fluorescence Materials via Donor Tuning:a Theoretical Study

Based on the boron-containing thermally activated delayed fuorescence(TADF)compound p-AC(AC:acridine)5,9-dioxa-13 b-boranaphtho[3,2,1-de]anthracene(a),a series of new TADF molecules b1-b4 were designed via adding two nitrogen atoms at the AC donor part.Density functional theory and time-dependent density functional theory calculations were performed on the frontier orbital energy levels,emission spectra,singlet-triplet states energy gaps(?EST),reverse intersystem crossing(RISC)rate constant(kRISC)for compounds a and b1-b4.Our calculation results show that the maximum emission wavelengths of b1-b4 are significantly blue-shifted by47-125 nm compared with that of a.Molecules b1 and b3 exhibit dark-blue emission,while molecules b2 and b4 display light-blue emission,indicating that these four derivatives could be potential organic light-emitting diode(OLED)candidates with blue-light emitting.Moreover,we found the RISC processes in a,b2,and b4 can occur not only from T_(1) state to S_(1) state,but also from T_(2) state to S_(1) state significantly,while the RISC processes in b1 and b3 mainly take place via the T_(2)→S_(1) hot exciton way.Importantly,the T_(1)→S_(1) kRISC values of b2 and b4 are predicted to be two to three times of that of a,indicating enhanced TADF property.Our results not only provide two promising boron-based TADF candidates(b2 and b4),but also offer useful theoretical basis for the design of blue OLED materials.

Recent advancements in 2D nanomaterials for cancer therapy

Since mechanical exfoliation of graphene in 2004, unprecedented scientific and technological advances have been achieved in the development of two-dimensional(2 D) nanomaterials. These 2 D nanomaterials exhibit various unique mechanical, physical and chemical properties on account of their ultrathin thickness, which are highly desirable for many applications such as catalysis, optoelectronics, energy storage/conversion, as well as disease diagnosis and therapeutics. In this review, we summarized recent progress on the design and fabrication of functional 2 D nanomaterials capable of being applied for the cancer treatment including drug delivery, photodynamic therapy, and photothermal therapy. Their anticancer mechanisms were discussed in detail, and the related safety concerns were analyzed based on current research developments. This review is expected to provide an insight in the field of 2 D nanostructured materials for anticancer applications.

Organic indoor light harvesters achieving recorded output power over 500%enhancement under thermal radiated illuminances

Organic photovoltaic(OPV)cells have found their potential applications in the harvest of indoor light photons.However,the output power of such indoor devices is usually far from the demand of the internet of things.Therefore,it is essential to boost the output power of indoor organic photovoltaics to a much higher level.As wildly deployed among industrial and civil luminous environments,thermal radiation-based indoor light sources are alternative candidates to supply the essential power of the off-grid electronics with a broad consecutive emission spectrum.In this work,we evaluated the photovoltaic performance of organic solar cells under indoor incandescent and halogen illuminations.Impressively,under such thermal radiations,an improvement over 500%of the output power density can be achieved in comparison with that under light-emitting diodes and fluorescent lamps,reaching a record high value of 279.1 lWcm^(-2) by the PM6:Y6-based device.The remarkable power output is originated from the extra near-infrared spectrum of indoor thermal lights,which restricts the effective area under 10 cm^(2) in achieving 1 mW output power.This work clarifies the feasibility of collecting photons radiated from indoor thermal light sources through OPV cells,and enlightens the further applications of indoor OPV cells under multiple illumination environments.

Study and development of high peak power short pulse Nd:YAG laser for peening applications

Because short pulse Nd:YAG laser of nanosecond pulse-width and high peak power has a unique capability to improve the mechanical properties of metal parts,a study on the development of high peak power short pulse from Nd:YAG laser along with its peening application has been performed.The design scheme of laser and the characteristic of laser beam transmission are presented and discussed.A pulse energy of 25 J with 15 ns pulse-width and a maximum peak power of 1660 k W laser system which use one oscillation and eight amplifiers has been achieved.Laser beam has a max divergence angle of 0.03 mrad,a pulse-to-pulse pulse-width stability of±0.1 ns,and the pulse-to-pulse energy stability factors of less than±2.8%.A low value of divergence means an easier modification of a nearly hat-top laser beam intensity profile and an easier transmission of laser beam.To evaluate the performance of the laser system,several metal materials are processed.Laser peening quality and efficiency are analyzed by using an optical microscope,a transmission electron microscope,and an X-ray diffraction device.The processing results show that the performance of this laser system is excellent.

Non-Contact Measurements of Water Jet Spreading Width with a Laser Instrument

Jet spreading width is one of the important characteristics of water jets discharging into the air.Many researchers have dealt with measuring this width,and contact measuring methods on the water jet surface were employed in a lot of the cases.In order to avoid undesirable effects caused by the contact on the jet surface,we introduce non-contact measuring methods with a laser instrument to the measurements of jet spreading width.In measurements,a transmitter emits sheet-like laser beam to a receiver.The water jet between the transmitter and the receiver interrupts the laser beam and makes a shadow.The minimum and maximum values of the shadow width are measured.In addition,pictures of the water jet are taken with a scale,and the shadow width is measured from the pictures.The experiments on various needle strokes were performed.Three kinds of width consistent with the jet structure were obtained.In the results,it can be concluded that our non-contact measuring methods are feasible.The data of jet spreading widths and jet taper were obtained and are useful for future applications.