Determination of the refractive index of BaY2F8:Er3+ (0.5 mol% to 30 mol %) in the 300 nm to 1800 nm range by ellipsometry; a record-breaking upconversion material
Determination of the refractive index of BaY2F8:Er3+ (0.5 mol% to 30 mol %) in the 300 nm to 1800 nm range by ellipsometry; a record-breaking upconversion material
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DOI：
10.1016/j.jlumin.2020.117639
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发表时间：
2021-02-01
影响因子：
3.6
通讯作者：
Marques-Hueso, Jose
中科院分区：
文献类型：
--
作者：
Gibbons, Joseph;Jones, Callum M. S.;Marques-Hueso, Jose
本文报道了掺三价铒（Er 3+）的单晶氟化钇钡（BaY 2F 8）的椭圆偏振光谱研究，BaY 2F 8最近被证明是最好的光子上转换材料之一。这涵盖了BaY 2F 8在从紫外（UV）到近红外（NIR）的大范围波长中的应用。我们详细介绍了BaY 2F 8：Er 3+（0.5摩尔%，10摩尔%，和30摩尔%）的光学性质，通过可变角椭圆偏振光谱仪测量的光谱范围从300 nm至1800 nm，报告的折射率为BaY 2F 8：Er 3+的第一次。在λ = 1493 nm激发下，研究了BaY_2F_8：Er ~（3+）样品的上转换外光致发光量子产率（ePLQY）。在辐照度为（6.23 +/- 0.45）x 10（-2）W/cm（2）时，发现最大掺杂浓度为30 mol% Er 3+的BaY 2F 8的ePLQY最高，达到3.62% +/-0.01%的值。折射率（λ = 589.3 nm）测定为0.5mol%为1.4808 +/- 0.014，10mol%为1.4980 +/- 0.003，30mol%为1.5022 +/- 0.006。随着Er ~（3+）掺杂浓度的增加，薄膜的折射率增大。所有样品均随波长的增加而单调下降。BaY_2F_8：Er ~（3+）的布鲁斯特角约为56 °，阿贝数高达124.62。这些发现提供了有价值的洞察BaY 2F 8：Er 3+的光学性质，在广泛的频率范围内，已被证明是有用的。
This work reports the ellipsometric study of trivalent erbium (Er3+) doped monocrystalline barium yttrium fluoride (BaY2F8), which has recently been shown to be one of the best photon upconversion (UC) materials available. This spans the BaY2F8 applications in a large range of wavelengths, from ultraviolet (UV) to near infrared (NIR). We detail the optical properties of BaY2F8: Er3+ (0.5 mol%, 10 mol%, and 30 mol%), measured via variable angle spectroscopic ellipsometry over a spectral range from 300 nm to 1800 nm, reporting for the first time the indices of refraction for BaY2F8:Er3+. The upconversion external photoluminescence quantum yield (ePLQY) of the BaY2F8:Er3+ samples have also been studied by exciting at lambda = 1493 nm. The highest ePLQY of BaY2F8 was found for the largest dopant concentration 30 mol% Er3+ reaching the value of 3.62% +/- 0.01%, at an irradiance of (6.23 +/- 0.45) x 10(-2) W/cm(2). The refractive index (lambda = 589.3 nm) was determined to be 1.4808 +/- 0.014 for 0.5 mol%, 1.4980 +/- 0.003 for 10 mol%, and 1.5022 +/- 0.006 for 30 mol%. Increasing Er3+ doping concentration increased the refractive index. All samples decreased monotonically with increasing wavelength. The Brewster angle of BaY2F8:Er3+ is observed to be approximate to 56 degrees, whilst the Abbe number of the samples was found to be as high as 124.62. These findings provide valuable insight into the optical properties of BaY2F8:Er3+ in the wide range of frequencies that is has proven useful.