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A high quantum efficiency CaAlSiN3:Eu2+ phosphor-in-glass with excellent optical performance for white light-emitting diodes and blue laser diodes
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2020-06-22 , DOI: 10.1016/j.cej.2020.125983
Yujie Zhang , Zelong Zhang , Xiaodong Liu , Guangzhan Shao , Linli Shen , Jianming Liu , Weidong Xiang , Xiaojuan Liang

CaAlSiN3:0.2%Eu2+ (CASN:Eu2+), an excellent red phosphor, plays a leading part in wide color gamut and high color rendition white light-emitting diodes (wLEDs). However, this phosphor or silicone resin mixture possesses a fatal defect of an intrinsic low thermal performance, which makes it hardly useful in high-power laser lighting and displays. Here, to improve the thermal performance of the CASN:Eu2+ phosphor, a series of red-emitting phosphor-in-glass materials (R-PiGs) with different CASN:Eu2+ concentrations (5–50 wt%) and sintering temperatures (750–850 °C) were successfully synthesized by dispersing the CASN:Eu2+ phosphor into a B2O3-Na2O-SiO2-CaO glass matrix. Surprisingly, the prepared R-PiGs showed a high external quantum efficiency (EQE) of 53%, and still maintained 82% efficiency compared with the CASN:Eu2+ phosphor (65%). The R-PiGs are superior to red ceramics for low cost and rapid batch preparation. Considering the densification of the R-PiGs, a systematic study was conducted on 10 wt% R-PiG sample. A facile chromaticity tuning for the configured wLEDs was obtained within the color range change from cool white to warm white when using the R-PiGs with different CASN:Eu2+ concentrations. Besides, we have successfully assembled a warm wLED with high luminous efficacy (90.3 lm/W) and color rendering (Ra = 94.2 and CCT = 5053 K). When irradiated by a blue laser, an optimized R-PiG can show enhanced luminous flux (49.27 lm) at a high laser incident power of 1.90 W/mm2. Therefore, with their excellent performances, R-PiGs are highly promising for use as red color converters for potential applications in tunable wLEDs and high-power laser lighting.



中文翻译:

一种高量子效率的CaAlSiN 3:Eu 2+玻璃荧光粉,具有出色的光学性能,适用于白色发光二极管和蓝色激光二极管

CaAlSiN 3:0.2%Eu 2+(CASN:Eu 2+)是一种出色的红色磷光体,在宽色域和高显色性白色发光二极管(wLED)中起着主导作用。然而,这种磷光体或有机硅树脂混合物具有固有的低热性能的致命缺陷,这使其几乎不能用于高功率激光照明和显示器。在这里,为了改善CASN:Eu 2+荧光粉的热性能,使用了一系列具有不同CASN:Eu 2+浓度(5-50 wt%)的红色发光玻璃态荧光粉材料(R-PiGs )和烧结通过将CASN:Eu 2+荧光粉分散到B 2 O 3中,成功合成了温度(750–850°C)-Na 2 O-SiO 2 -CaO玻璃基质。出人意料的是,与CASN:Eu 2+荧光粉(65%)相比,制备的R-PiGs具有53%的高外部量子效率(EQE),并且仍保持82%的效率。R-PiG在低成本和快速批处理方面优于红色陶瓷。考虑到R-PiG的致密化,对10重量%的R-PiG样品进行了系统的研究。当使用具有不同CASN:Eu 2+的R-PiG时,可以在从冷白到暖白的颜色范围内更改配置的wLED的简便的色度调整。浓度。此外,我们已经成功组装了具有高发光效率(90.3 lm / W)和显色性(Ra = 94.2和CCT = 5053 K)的温暖的wLED。当被蓝色激光照射时,优化的R-PiG在1.90 W / mm 2的高激光入射功率下可以显示出增强的光通量(49.27 lm)。因此,由于R-PiG具有出色的性能,因此非常有希望用作可转换wLED和大功率激光照明中潜在应用的红色转换器。

更新日期:2020-07-02
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