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High CRI in phosphor-in-doped glass under near-ultraviolet excitation for warm white light-emitting diode
Journal of Luminescence ( IF 3.6 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.jlumin.2020.117684
A. Arellano-Morales , J. Molina-González , H. Desirena , J.M. Bujdud-Perez , S. Calixto

Abstract A series of phosphor-in-doped glass (PiDG) were fabricated through a CO2 laser heating, blending commercial green phosphor SrAl2O4:Eu2+ and Eu3+-doped boro-tellurite glass powders. Translucent PiDGs with low loss of the emissive properties of the SrAl2O4:Eu2+ phosphor can be only achieved through CO2 laser heating; whereas, sintering of PiDGs by means of the conventional method (electric furnace) lead to opaque samples with loss of entire of green emission. Long exposure time of the CO2 laser modifies the PiDGs melt volume due to temperature rise, increasing their diameter and thickness. The fast cooling of CO2 laser approach allows the sintering of transparent PiDGs, avoiding opaque samples and low radiometric properties. A warm white light-emitting diode (w-LED) prototype was fabricated by placing PiDGs on top of a near-ultraviolet (n-UV) chip at 385 nm, showing a high color rendering index (CRI) and a low correlated color temperature (CCT) of 88 and 2369 K respectively. However, a lower CCT with a detriment of CRI can be achieved by using a low SrAl2O4:Eu2+ phosphor concentration. The PiDGs obtained show enormous potential to be applied as a phosphor converter in warm w-LEDs for residential applications.

中文翻译:

近紫外激发下掺磷玻璃的高显色指数用于暖白光发光二极管

摘要 通过 CO2 激光加热,混合商业绿色荧光粉 SrAl2O4:Eu2+ 和 Eu3+ 掺杂硼碲酸盐玻璃粉末,制备了一系列掺磷玻璃 (PiDG)。SrAl2O4:Eu2+ 荧光粉发射特性损失低的半透明 PiDG 只能通过 CO2 激光加热来实现;而通过传统方法(电炉)烧结 PiDG 会导致样品不透明,并且会损失整个绿色发射。由于温度升高,CO2 激光的长时间暴露会改变 PiDG 的熔体体积,增加它们的直径和厚度。CO2 激光方法的快速冷却允许烧结透明 PiDG,避免不透明样品和低辐射特性。通过将 PiDG 放置在 385 nm 的近紫外 (n-UV) 芯片顶部制造了暖白光发光二极管 (w-LED) 原型,显示出高显色指数 (CRI) 和低相关色温(CCT) 分别为 88 和 2369 K。然而,通过使用低 SrAl2O4:Eu2+ 磷光体浓度可以实现较低的 CCT,但会损害 CRI。获得的 PiDG 显示出巨大的潜力,可用作住宅应用的暖 w-LED 中的磷光体转换器。
更新日期:2021-01-01
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