真空电子技术

0463.1 95030084电离气体变色发光机理的研究/陈宗柱(东南大学电子工程系)/l东南大学学报一1 995,25(l).一1~7 从发光动力学观点论述电离气体变色发光的机理.从激发辐射的简化模型着手,研究在合适的变色发光介质中,利用控制电子能量产生选择性激发来实现变色发光,图6表3参10(南)(6)一1~2 用彩色亮度计测试电致发光材料,可以得出准确的绝对亮度和色度坐标,这对发光材料的研究和为实现电致发光多色化而进行的发光材料的混色配制是一个有力的工具和行之有效的方法.图2(许) 0461 95030085 双层辉光离子渗金属技术中的离子轰击行为/贺志 勇,高原,…     

电离气体变色发光的光色研究

在电离气体变色发光实现的基础上，测量了光谱相对功率分布。应用格拉斯曼定律，解释变色发光的颜色视觉和计算它们的ＣＩＥ色度坐标。对于电离气体变色发光的光色控制也作了报导。     

气体放电变色发光的变色范围研究

利用控制选择性激发反应,可以获得气体放电变色发光。气体放电在受激发射情况下得到单色光,在自发发射情况下人眼的色感觉是单一光色,但实际上它包含了多种波长的光辐射。气体放电变色发光的实际应用主要取决于它的变色范围和变色发光的亮度。     

电离气体变色发光的实现及其在显示技术中的应用

采用控制电子能量产生选择性激发，实现了电离气体变色发光。讨论了在显示技术中的应用；设计和制作了由一个发光单元组成、单彩色象素的试验用彩色象素管，在不同时间能可控地发射红、绿和蓝光，并测量了它的变色发光范围。     

真空电子技术

0463.1 .95060107高性能电子柬产生装置及性能测试/王水刚,樊晓 一10一伟,徐克尊,邢士林,张芳,李兴德(中国科技大学)I/核电子学与探测技术一1995,15(3)一192~194介绍了一种高性能电子束产生装置的实现方法,并给出该装置的各种参数的实验测试方法和结果.图4参3浦)0461 .95060108电离气体变色发光的光色研究/陈宗柱(东南大学)11光电子·激光一1995,6(4)一237~240 在电离气体变色发光实现的基础上,测量了光谱,相对功率分布·应用格拉斯曼定侈,解释了变色发光的颜色视角和计算了它们的CIE色度坐标.图2参或木);(山东工业大学)l)光电子·激光:一…     

变色气体发光显示技术的研究

通常一个发光显示单元的光色是不变化的.本文从电离气体选择性激发的原理出发,实现了变色气体发光显示,即对于同一气体发光显示器件在不同时间能可控地发出不同波长的可见光.     

动态光谱智能分析的硬件设计

本文提出了一种应用微机对显示器件的动态光谱进行分析的方法,着重于微机接口的硬件设计．该方法适用于测量所有发光器件的光谱,对于研制变色发光器件的现时监控、调试和测量更显示出其突出的优点,具有一定的开发研究和实用价值。     

光电子薄膜器件

本文介绍了光电导，场致发光，和电致变色等光电子功能薄膜及器件，着重于应用于大屏幕显示和可见－红外动态图象转换系统的液晶光阀空间光调制器，电致发光以及场致变色薄膜器的原理，制作及特性等。     

气体放电变色发光的光谱相对强度分布研究

获得气体放电变色发光的关键在于控制放电子能量,通过选择性激发,得到不同激发态的光辐射。气体放电发光不是单色光,在低气压情况下,主要是激发辐射并产生线光谱;在高压情况下,复合辐射起了重要作用并产生连续光谱。气体放电发光颜色由它的光谱相对强度分布决定,在不同的光谱相对强度分布下,可计算出CIE表色系统的色坐标值,也可由人眼直接观察和用色度计加以测量。     

光学材料

0118296Er~(3+),Yb~(3+)掺杂氟氧化物微晶玻璃上转换发光的研究[刊]/林葵//光电子·激光.—2001,12(5).—484～487(E)测量了 Er~(3+)掺杂氟氧化物微晶玻璃、Er~(3+),Yb~(3+)掺杂氟氧化物微晶玻璃退火前后3种样品的吸收光谱、上转换发光光谱及其强度随泵浦光强的变化,对比讨论了其上转换发光特性。参80118297金属/介质型纳米复合变色膜[刊]/赖珍荃//功能材料与器件学报.—2001,17(2).—141～146(E)     

彩色PDP中几种工作气体和荧光粉对提高发光效率的作用

彩色ＰＤＰ的发光效率在很大程度上与工作气体和荧光粉有关。本文比较了三种系列潘宁气体的真空紫外辐射性能和七种真空紫外荧光粉的激发和发射性能，择其应用于ＡＣＰＤＰ。测试表明，当气体以合理配比和充气压放电产生的共振辐射线与三基色荧光粉激发和发射性能匹配时，可获得高的发光效率。文中还根据发光效率公式提出对研制荧光粉的要求。     

A Double‐Layer Mechanochromic Hydrogel with Multidirectional Force Sensing and Encryption Capability

Hydrogel‐based soft mechanochromic materials that display colorimetric changes upon mechanical stimuli have attracted wide interest in sensors and display device applications. A common strategy to produce mechanochromic hydrogels is through photonic structures, in which mechanochromism is obtained by strain‐dependent diffraction of light. Here, a distinct concept and simple fabrication strategy is presented to produce luminescent mechanochromic hydrogels based on a double‐layer design. The two layers contain different luminescent species—carbon dots and lanthanide ions—with overlapped excitation spectra and distinct emission spectra. The mechanochromism is rendered by strain‐dependent transmittance of the top‐layer, which regulates light emission from the bottom‐layer to control the overall hydrogel luminescence. An analytical model is developed to predict the initial luminescence color and color changes as a function of uniaxial strain. Finally, this study demonstrates proof‐of‐concept applications of the mechanochromic hydrogel for pressure and contact force sensors as well as for encryption devices.     

Luminescence of Nanodiamond Driven by Atomic Functionalization: Towards Novel Detection Principles

High biocompatibility, variable size ranging from ≈5 nm, stable luminescence from its color centers, and simple carbon chemistry for biomolecule grafting make nanodiamond (ND) particles an attractive alternative to molecular dyes for drug‐delivery. A novel method is presented that can be used for remote monitoring of chemical processes in biological environments based on color changes from photoluminescent (PL) nitrogen‐vacancy (NV) centers in ND. The NV luminescence is driven chemically by alternating the surface chemical potential by interacting atoms and molecules with the diamond surface. Due to the small ND size, the changes of the surface chemical potential modify the electric field profile at the diamond surfaces (i.e., band bending) and intermingle with the electronic NV states. This leads to changes in NV^?/NV° PL ratio and allows construction of optical chemo‐biosensors operating in cells, with PL visible in classical confocal microscopes. This phenomenon is demonstrated on single crystal diamond containing engineered NV centers and on oxidized and hydrogenated ND in liquid physiological buffers for variously sized ND particles. Hydrogenation of NDs leads to quenching of luminescence related to negatively charged (NV^?) centers and as a result produces color shifts from NV^? (638 nm) to neutral NV° (575 nm) luminescence. How the reduction of diamond size increases the magnitude of the NV color shift phenomena is modeled.     

The thermal structure of the ionosphere

From a large number of rocket, satellite, and ground-based experiments since 1959 it is known that the electron and ion gases of the middle and upper ionosphere are substantially hotter than the neutral atmosphere. At low and midgeomagnetic latitudes the principal heating agent for the ionospheric plasma lies in the excess kinetic energy given to photoelectrons arising from the ionization of the atmospheric gases by solar ultraviolet radiation. Although the photoelectrons lose most of their kinetic energy in the excitation of atomic and molecular gases, a significant amount of energy is given to the ambient Maxwellian electron gas, increasing its temperature above that of the neutral gases. The ion gases, in contrast, appear to be heated almost entirely through the elastic collisions with ambient electrons so that the ion temperature generally lies between the electron and neutral temperatures. The calculation of theoretical temperature profiles has developed into a moderately sophisticated process with a fair degree of correspondence between predicted and observed values for undisturbed geophysical conditions. Current research emphasizes the global aspects of plasma temperatures and the connection between ionospheric and magnetospheric phenomena. However, many of the observed diurnal and seasonal variations in both electron and ion temperatures depend upon the couplings between the neutral and ionized atmospheres, and a complete understanding of all aspects of the ionospheric thermal balance is not possible at the present time.     

Plasmon‐Enhanced Blue Upconversion Luminescence by Indium Nanocrystals

Numerous endeavors have been undertaken to gain enhanced upconversion luminescence via surface plasmon resonance (SPR) generated by specially designed nanostructures of noble metals (e.g., Au, Ag). However, the SPR response of these metals is usually weak in the ultraviolet (UV) region because of their intrinsic electronic configurations; thus, only green and red upconversion emissions can undergo significant plasmonic enhancement yet without selectivity, while an efficient approach to selectively enhancing the blue upconversion luminescence has been lacking. Herein, by integrating the pronounced UV SPR of silica‐coated indium nanocrystals (InNCs) with blue‐emission upconversion nanoparticles (UCNPs) of NaYbF₄:Tm, an up to tenfold selective luminescence enhancement at 450 nm is obtained upon 980 nm laser excitation. Precise manipulation of the silica shell thickness suggests an optimal working distance of 3 nm between InNCs and UCNPs. This study has, for the first time, realized selective blue upconversion luminescence enhancement by using an inexpensive, non‐noble metal material, which will not only enrich the fundamental investigations of SPR‐enhanced upconversion emission, but also widen the applications of blue light‐emitting nanomaterials, for example, in therapeutics.     

Improvement of emission efficiency and color rendering of high-power LED by controlling size of phosphor particles and utilization of different phosphors

White light can be produced by a combination of red, green and blue emitting diode chips or by the combination of a single diode chip with phosphors. Presently, more single chip white light-emitting diodes (LEDs) than multi-chip one are used because of their low cost, easily controlled circuitry, ease of maintenance and favorable luminescence efficiency. Since phosphors must be used as light converting materials in a single diode chip to obtain the desired emission, this study considers the problems encountered in using phosphors in LEDs. The proper application of phosphors in the package of LED can improve its efficiency, color rendering and thermal stability of luminescence. For example, a uniform size distribution of phosphors with red, green and blue emission helps to improve luminescence efficiency by preventing cascade excitation; the change in color with temperature can be overcome by counter-balancing red-shifting and blue-shifting phosphors; larger particles help to ensure the high efficiency of high-power LEDs, and costs can be reduced by using small particles size in low-power LED packaging because allows less phosphor to be used to obtain a particular efficiency.     

激发波长和电化学腐蚀对注碳外延硅荧光特性的影响

电化学腐蚀是蓝光发射的前提,但不同的电化学腐蚀条件对发光强度和峰位影响极大,随着电化学腐蚀条件的加强,蓝光峰将被红光峰代替。激发光波长亦可影响蓝光发射,如260nm的激发光将引起在360nm光激发下所获得的431nm蓝光峰的蓝移。     

Excitation of luminescence in porous silicon with adsorbed ozone molecules

A new effect of the excitation of luminescence in porous silicon during adsorption of ozone from the gaseous phase was investigated. The signals of ozone-induced luminescence and photoluminescence decay with time of ozone exposure in a strictly correlated way; simultaneously, an oxide-phase growth is observed in porous silicon. A linear relationship was found between the luminescence intensity and the amount of oxide phase formed in the presence of ozone. Correlated shifts in the spectra of ozone-induced luminescence and photoluminescence are observed if the porosity of silicon varies. A mechanism for this effect is proposed. According to this mechanism, in the case of the dissociative adsorption of ozone, the exothermic reaction of oxidation of backbonds of a silicon atom takes place on the surface of nanocrystallites. Energy released is spent for the excitation of electron spectrum of silicon crystallites. The radiative relaxation in the case of ozone excitation proceeds similarly to that of the photon excitation of luminescence in porous silicon.