平板等离子体紫外灯研究

在本文中,运用ITO玻璃和多孔氧化铝设计了一种平板等离子体紫外灯,最大辐射功率为230 mW.通过实验方法,研究并讨论了放电气体压强和放电气体组成对平板等离子体紫外灯紫外光辐射效率的影响.通过优化,平板等离子体灯的紫外灯紫外光辐强密度显著提高.实验结果显示:在3.3×104 Pa、气体间隙0.71 mm、前板玻璃厚为2.8 mm的平板等离子体紫外灯中,运用1 vol％氮气和99 vol％氩气混合气体作为放电气体时,紫外灯辐射功率密度最高可达到18 mW/m2.     

等离子体平板显示用发光材料

本文介绍了ＰＤＰ用荧光粉的基本情况及其应用特性。归纳出基团敏化带位置的一般规律及阳离子对基团敏化带波长位移的影响，并指出，提高发光效率，改善荧光粉的热稳定性和辐照稳定性，开发新型稀灾粉等具有重要意义。     

紫外和真空紫外光谱辐射标准灯一氘灯

本介绍了作为紫外和真空紫外标准灯一氘灯的一些特点，并阐述了用同步辐射源标定氘灯光谱辐射亮度的装置和方法。     

一种新型的紫外光源—准分子紫外灯

非相干性紫外或真空紫外光源的应用已成为众多工业部门中一项基础性和关键性的技术,本着重介绍一种使用介质阻挡放民激发紫外或真空紫外辐射的新型光源－－准分子此外灯,包括准分子的形成以及光源的紫外辐射效率,最后,对影响准分子辐射的因素如气压,气体组成,温度及电源频率和电压进行了初步的分析。     

提高掺Er硅发光效率的途径与前景

阐述了掺Ｅｒ硅发光的研究意义和现状,总结了掺Ｅｒ硅的材料性能、发光机理、提高发光效率的途径、制备方法,以及掺Ｅｒ硅ＬＥＤｓ器件的行为和未来展望。     

发光示踪材料的空间环境稳定性研究

通过简单模拟高真空、太阳紫外辐射、冷热交变等空间环境条件,对拟用于飞行器示踪的发光材料SrAl2O4:Eu2 ,Dy3 、ZnO:Eu3 ,Li1 以及SiO2:Eu3 ,Li1 进行了空间环境稳定性试验研究,分别检测了3种材料在高真空条件下的耐强紫外辐射、抗老化、抗热震性能.结果表明,长余辉发光材料SrAl2O4:Eu2 ,Dy3 经各试验后发光强度均有一定程度的降低,但由于其自身发光强度很高,下降幅度不影响其在"背日面"的示踪功用;而ZnO:Eu3 ,Li1 较SiO2:Eu3 ,Li1 的空间环境稳定性比较优越,是适合于"向日面"示踪的发光材料.     

交流等离子体显示屏放电的瞬态辐射特性研究

为深入理解彩色交流等离子体显示屏的气体放电机制及提高器件性能，对三元混合气体He-Ne（26％）．Xe（3．7％）放电的辐射光谱组成和光谱线的瞬态过程进行了实验研究。通过采用高速增强型CCD（ICCD）和光电倍增管（PMT）测量混合气体不同压强时，在一个维持电压脉冲期间，放电所产生的真空紫外和红外各主要谱线的强度随时间的变化，研究了充气压强对谱线强度、辐射延迟、辐射持续时间的影响，并分析了放电产生的真空紫外辐射总强度和可见光光谱线强度随充气压强的变化关系。实验结果表明，随着充气压强的提高，真空紫外和红外光谱辐射延迟缩短，辐射持续时间减小，并且真空紫外辐射总强度增大，可见光强度减小。     

抑制GaN基LED发光效率衰减的研究进展

目前蓝宝石衬底氮化镓基发光二极管取得了显著发展,但在通用照明领域中,GaN基LED仍然需要更高的发光效率和光输出功率。提高发光亮度和抑制大电流注入发光效率衰减是当前GaN基LED领域的研究重点。从GaN基LED外延层内部结构即电子发射层、发光复合区量子阱、电子阻挡层方面介绍了近年来提高LED发光亮度和抑制发光效率衰减的最新进展,分析了电子发射层、发光复合区结构、电子阻挡层对LED性能的影响,并展望了其未来的发展趋势。     

Effect of a protective layer on the lifetime and output radiation intensity decay rate of quartz low-pressure gas discharge lamps

A protective layer of rare earth metal oxides deposited onto the inner surface of a quartz bulb increases the lifetime of low-pressure inert gas arc discharge lamps and decreases the output UV radiation intensity decay rate in low-pressure amalgam lamps.     

机床面板外观设计的人机效率

 为了系统地研究机床面板外观各因素对操作效率的影响情况,在对认知心理学、人体工学等理论研究的基础上,提出针对机床的人机界面操作效率设计原则,并将其运用到DK系列电火花数控切割机床面板的改良设计中,形成针对面板色彩、按键位置、按键形状、按键大小、按键符号各个单因素以及全部综合因素而进行的改良设计方案。通过预测法定性分析人机界面中诸因素对界面效率的影响程度,并采用模拟实验方法,定量测量了每个因素对界面效率影响程度的大小,并证明以上5个要素的设计改善对提高效率是有效的,而综合全面改良的效果最优,也达到最优外观效果,可以说是“好看即好用！”。     

Radiometric characterization of ultrahigh radiance xenon short-arc discharge lamps

Xenon short-arc discharge lamps exhibit ultrahigh radiance with substantial emission beyond the visible, primarily in the near infrared. Their radiance distributions are spatially and angularly inhomogeneous due to both the structure of the plasma arc and the infrared radiation from the electrodes. These characteristics are favorable for high-irradiance biomedical and high-temperature reactor applications that exploit both visible light and infrared radiation. For the affiliated optical designs, full-spectrum radiometry, rather than just visible photometry, is needed and not extensively available. We present experimental measurements for the spectral, spatial, and angular distributions of such 150 W lamps and relate the consequences for such novel applications.     

Excited xenon density and ion-induced secondary electron emission coefficient for vacuum ultraviolet luminous efficiency in alternating current plasma display panel

It is shown for Xe content ratio of 10% that the excited xenon atom density for the 1s₅ metastable state is 3.0 × 10¹² cm^− 3 with a gap distance of 50 μm under a fixed gas pressure of 5.3 × 10⁴ Pa in alternating current plasma display panels. It is observed that the VUV emission of 173 nm continues after its peak and lasts much longer than 147 nm emission. We also found that the time of VUV peak emission intensity for higher xenon mole fraction is longer. It is also concluded that the luminous efficiency is strongly dependent on the ion-induced secondary electron emission coefficient.     

Variation of the instantaneous luminous flux of fluorescent lamps fed by dimmable electronic ballasts with frequency control

Effects of hysteresis and inertial processes on the instantaneous luminous flux of fluorescent lamps (FLs) are experimentally investigated, which are fed by frequency controlled, dimmable, electronic ballasts. Other phenomena are also examined, such as the time displacement between the light ripple and the waveform of the electrical power of the lamp, the 'modulation' of the instantaneous luminous flux waveform and generally, the behaviour of the lamp at varying high frequency (HF) levels. For a typical FL, fed by dimmable electronic ballast with frequency control, inertial processes are reduced, as the operating frequency of the lamp decreases. The time displacement between the instantaneous luminous flux and the lamp power has maximal and minimal as frequency varies. As frequency of the FL increases, the diffusion of the metastable states of the Hg atoms is enhanced and the 'modulation' of the instantaneous luminous flux decreases. The hysteresis and the looping of lamp's voltage-current and luminous flux- current characteristics at various frequency levels indicate that it is necessary to add an inductance and a capacitance to the equivalent electrical circuit of a FL at HFs.     

Spectral luminous efficiency as a function of age.

Spectral luminous efficiency function for a 2-deg field at a photopic level (100 Td) was measured for 91 observers by flicker photometry (FP) and for 97 observers by direct brightness matching (DBM), to find age-related change in the efficiency function as well as to obtain a reliable data set to be used in photometry. Observers ranged in age from 11 to 78 years. A gradual reduction of luminous efficiency with age was observed for both functions by FP and by DBM in the short-wave region, which was expected because of the age-related increase of optical density of eye lens. A similar age-related reduction of efficiency was observed in the long-wave region for the function obtained by DBM; this reduction was regarded as being due to reduced chromatic contribution to brightness with age. Principal components analysis on the spectral efficiency data and an analysis of the efficiency difference between the data obtained by DBM and FP confirmed this conclusion. Assuming a log-linear change in efficiency with age for any wavelength throughout the life span, spectral luminous efficiency function at any age was derived for photometric use.