一种绿色荧光粉及其制备方法和应用

本发明提供了一种绿色荧光粉及其制备方法，所述绿色荧光粉的化学式为：(Ba1-x-ySrxEuy)9Lu2Si6O24，其中，0≤x≤0.9999，0.0001≤y≤0.3，0.0001≤x+y≤1，x、y为摩尔分数。本发明还提供了绿色荧光粉在白光LED中的应用。本发明还提供了所述绿色荧光粉在场发射显示屏中的应用。本发明提供的绿色荧光粉具有生产成本低、制作工艺简单、激发波长范围广等优点，在紫外或蓝光激发下，能够发射绿光

陶瓷闪烁体阵列及其制备方法

本发明公开了一种陶瓷闪烁体阵列，包括多个陶瓷闪烁体基元，所述多个陶瓷闪烁体基元呈阵列结构排列；每个所述陶瓷闪烁体基元的出光面表面粗糙。本发明的陶瓷闪烁体阵列的出光面具有较高的光出射效率，因此，光子探测设备接收到的光信号更强，有利于提高最终的成像质量；且光出射效率的提高可以降低探测器后端信号接收及处理的难度，降低了探测器匹配设备的制造成本。同时，本发明还提供了一种陶瓷闪烁体阵列的制备方法，该方法将陶瓷闪烁体基元的出光面表面进行粗化处理，提高了陶瓷闪烁体阵列的光出射效率

激光陶瓷的制备方法

本发明公开了一种激光陶瓷的制备方法，包括以下步骤：将分子式为MF2的氟化物粉体与分子式为ReFn的氟化物粉体按一定比例混合，作为反应原料；或者将分子式为Re:MF2的氟化物单晶粉碎后得到的粉晶作为反应原料；其中，M为碱土金属离子，Re为Mn2+和-或稀土离子，n＝2或3；将所述反应原料研磨、混匀、干燥后得到前驱体粉末；将所述前驱体粉末放入模具中，置于放电等离子烧结炉中，在真空环境或保护气氛下，升温至600℃～1100℃，保温0min～60min，冷却后得到烧结体；将所述烧结体打磨、抛光后，得到离子掺杂的碱土金属氟化物激光陶瓷。该方法过程简单，容易控制，有助于实现工业化的批量生产；同时，降低了烧结温度和能耗，缩短了烧结时间和制备周期

YAG∶Ce~(3+)在激光照明应用中的研究进展

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2005～2015年CERN光合有效辐射数据集

光合有效辐射在生态学、农学以及气候学等多个学科中都有重要的应用价值。它是揭示物质与能量交换过程的基本生理变量,是光合潜力、潜在产量的评估研究和作物生长模拟研究、土壤碳的固定模拟研究中不可缺少的关键数据之一。该数据集涵盖了中国8个典型陆地生态类型、中国生态系统研究网络(CERN)下属的40个辐射观测站观测的光合有效辐射日均值,时间跨度为2005～2015年。通过对传感器的集中标定与规范的数据质量控制方案,保障了观测数据的可靠性与可比性。采用光谱仪、辐射标准灯传递辐射基准方案,对光合有效辐射传感器进行集中标定与比对,标定精度小于5%,符合世界气象组织(WMO)标准;采用极值法对观测的光合有效辐射数据进行质量控制

Prediction of Energy Resolution in the JUNO Experiment

International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel