环保节能型发光混凝土材料的研制

采用高温烧制工艺,研究了原材料、成型温度、加热时间、发光粉掺量对氧化条件下制备发光石性能的影响。结果表明,以100目Sr Al2O4:Eu2+,Dy3+长余辉发光粉和低熔点硼酸盐玻璃粉为原材料,发光粉掺量为30%,温度800℃,加热时间为10 min,制备的发光石表观质量、强度及发光性能良好。将该发光石作为骨料应用于混凝土中,可制备出具有照明与装饰功能的发光露骨混凝土。     

Enhancement of the luminous efficiency of a ceramic phosphor plate by post-annealing for high-power LED applications

Currently, phosphor-converted white light-emitting diodes offer low energy consumption, good environmental stability, and a long lifetime. Hence, they are widely utilized in high-power light-emitting diode (LED) applications such as those in the automotive headlamp industries. However, obtaining high luminous efficiency of such diodes is challenging because of their internal structural properties such as micropores. Herein, we developed phosphor-in-glass (PiG) plates by mixing a blue LED chip and yellow phosphor to create high-power white LEDs (w-LEDs). In addition, the influence of post-annealing on the prepared PiG plates at different temperatures (350°C-550 °C) was investigated. Post-annealing, a treatment that facilitates the mobility of the ceramic matrix encapsulating the phosphor powder, decreases an LED's porosity, thereby enhancing its overall luminous efficiency. Results show that PiG plates post-annealed at 450 °C exhibit superior optical performance and effective color properties than PiG plates that were non-annealed or post-annealed at 350 °C, 400 °C, 500 °C, and 550 °C. Therefore, post-annealed PiG plates are more suitable potential materials for application in the high-power LED industry.     

Synthesis and optical properties of green to orange tunable garnet phosphors for pcLEDs

Y_3−xLu_xAl₃MgSiO₁₂:Ce³⁺ phosphors were prepared by aqueous sol-gel technique. Samples with 0.25, 0.5, 0.75 and 1 mol-% of Ce³⁺ were fabricated and characterized by powder X-ray diffraction (XRD), photoluminescence (PL) spectroscopy, and temperature dependent luminescence to reveal the thermal quenching. Moreover, luminous efficacies (LE), CIE 1931 color points and quantum efficiencies (QE) were calculated and discussed. XRD patterns confirmed the presence of single phase garnet for all samples independent of Ce³⁺ concentration and Y/Lu ratio. Phosphors showed broad band emission in the range 500-750 nm. The emission maximum shifts from 555 to 585 nm depending on the Ce³⁺ concentration and Y/Lu ratio. Quantum efficiency of the phosphors decreased with rising Ce³⁺ concentration and increased with increasing Lu content.     

建筑工程电气设计中的节能问题

介绍国内外建筑节能相关规范、标准的制定情况;从电动机、家用电器、配电变压器、照明灯具的选型等方面,探讨建筑工程电气设计中的节能理念、节能途径及方法;给出建筑电气专业节能专篇设计内容文字表述建议。     

发光涂料近期发展动态

本简要介绍了发光材料的发光机理及种类，简述了发光涂料的应用领域，并综述了近期国内外发光涂料的发展动态。     

菜市场光环境对农产品颜色感知的影响

光环境作为菜市场物理环境的重要部 分,对农产品的颜色呈现具有较大影响,决定了 购买者对农产品的品质评价。当前,针对LED光 源相关色温对农产品颜色感知的影响研究较少, 存在着不同类型农产品外观展示的适用光源无 法明确的问题。为了探究中国人对菜市场展示光 源的视觉偏好,改善菜市场照明环境质量,提高 购买者的体验感和满意度,本研究基于菜市场 光环境现状调研结果,以蔬菜、水果和鲜肉三 类典型农产品为观察样本,选择不同相关色温 的LED（2 500 K、3 000 K、4 000 K、5 000 K、 6 500 K）作为测试光源,通过心理物理实验,从 人因工学角度探讨LED光源相关色温对农产品 颜色感知的影响。研究表明：当测试光源相关色 温增加,农产品更加接近标准光源下的颜色,显 色指数不能很好地反映光源的颜色还原性;不同类型的农产品在色彩偏好度上具有差异,水果的偏好度在相关色温4 000~5 000 K时最高,蔬菜 类的偏好度在相关色温5 000~6 500 K时最高;测试光源下,人们对鲜肉的色彩偏好度总体低于水 果和蔬菜。本研究探讨了菜市场光源相关色温对农产品颜色感知的影响,为中国人色彩感知研究 和LED光源在菜市场中科学合理的应用提供参考与依据。     

Optimization of antireflection coating for VO2-based energy efficient window

Vanadium dioxide (VO₂) films have been proposed as energy efficient window coatings for their thermochromism, with which the solar energy transmission in the IR region may be controlled passively. These coatings suffer from low visible (or luminous) transmission (380–760 nm in wavelength), which hinders their practical uses. We here consider an antireflection (AR) coating for the VO₂-based window. Optical calculation was first performed upon a basic structure for thermochromic window composed of a VO₂ layer on glass with an AR layer of refractive index n and thickness d. Optimization was carried out on n and d for a maximum integrated luminous transmittance (T_lum). The calculation demonstrates that the optimal n value changes with thickness of VO₂, and at n≈2.2 it gives the highest T_lum enhancement from 32% (without AR coating) to 55% for 50-nm VO₂. Experiment was done on a structure of 50-nm VO₂ on quartz glass using ZrO₂, of which n≈2.2 matching the best n value, as AR coating. Formation of an optimized structure, ZrO₂ (56 nm)/VO₂ (50 nm)/quartz, was done by sputtering, and its optical properties were characterized with spectrophotometry. An improvement of T_lum from 32.3% to 50.5% was confirmed for the semiconductor phase with similarity also for the metallic one. The IR switching properties were not much deteriorated.     

LED光输出特性随管芯封装位置变化

借助2001型程控 LED 光电参数测试仪,分别测量了φ5和φ3两种系列 LED在相同封装条件下,LED 管芯位置高度不同对法向光输出强度及其空间角分布的影响,并从几何光学成像原理进行了分析。     

彩色等离子体显示器用荧光粉

本文阐述了荧光粉的发光特性对彩色等离子体显示器（ＰＤＰ）性能影响。介绍了荧光粉激发光谱和相对发光效率的测试方法，并对常用真空紫外荧光粉的发光特性进行了比较。最后分析说明了荧光粉的涂覆面积、厚度、颗粒度大小等因素对ＰＤＰ亮度和光效的影响。