Abstract At the present time there is no doubt that almost every country is experiencing a revolutionary change in the used devices for artificial lighting whether for public, for domestic or for work place illumination. This movement is taking place towards the substitution of fluorescent lamps to LED-phosphor based devices under the justification of reduction in energy consumption and mitigation of the contamination of environment produced by the mercury of fluorescent lamps. In this aspect, despite of the great effort of worldwide scientists to obtain a white lighting source with the emitting spectrum similar to that of the sunlight, it is recognized that there is still a challenge to be faced of getting luminescent materials with broad band excitation in the UV–Vis regions and large emission in the visible in order to allow tunable white lighting generation. Motivated by this interest, in this paper, Eu2+,3+/Pr3+ co-doped calcium aluminosilicate glasses were synthesized and spectroscopically investigated aiming at the development of smart white lighting devices. A prototype was developed to study the sample with excitation at 445 nm light emission diode (LED). The results indicate high color rendering index (CRI Ra ∼92–95) and tunable correlated color temperature (CCT from 5700 to 6600 K), covering the whole spectral daylight range. By using a second 405 nm LED together with the 445 nm one, the calculated Du’v’ values are suitable for indoor illumination. In this configuration, by adjusting the LEDs intensities it is possible to tune the CCT close to the white lighting region with CRI Ra nearly 95. These characteristics demonstrate that the Eu2+,3+/Pr3+ co-doped OH− calcium aluminosilicate glass is a strong candidate for smart white lighting with LEDs.

中文翻译：

---

用于可调白光设备的 Eu2+,3+/Pr3+ 共掺杂钙铝硅酸盐玻璃

摘要 目前，无论是公共照明、家庭照明还是工作场所照明，几乎每个国家都在使用人工照明设备进行革命性的变革，这一点毋庸置疑。在减少能源消耗和减轻由荧光灯的汞产生的环境污染的正当理由下，这种运动正在朝着将荧光灯替换为基于 LED 荧光粉的设备的方向发展。在这方面，尽管世界范围内的科学家为获得发射光谱与太阳光相似的白色光源做出了巨大努力，人们认识到，获得在 UV-Vis 区域具有宽带激发和在可见光区域具有大发射的发光材料以允许可调谐的白光产生仍然面临挑战。受这种兴趣的启发，本文合成了 Eu2+,3+/Pr3+ 共掺杂铝硅酸钙玻璃，并对其进行了光谱研究，旨在开发智能白光照明设备。开发了一个原型来研究在 445 nm 发光二极管 (LED) 下激发的样品。结果表明高显色指数（CRI Ra ∼92-95）和可调相关色温（CCT 从 5700 到 6600 K），覆盖整个光谱日光范围。通过将第二个 405 nm LED 与 445 nm LED 一起使用，计算出的 Du'v' 值适用于室内照明。