This work reports, for first time, on optically-driven white light emission from samarium-doped yttrium aluminum garnet ceramic, Sm-doped YAG. Nanocrystalline Sm-doped YAG sample has been prepared via co-precipitation method then transformed to bulk ceramic by sintering process using Spark Plasma Sintering (SPS) technique. X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) are used to characterize the crystal structure of the nanocrystals. The micro-grains of the obtained ceramic have been demonstrated by scanning electron microscope (SEM). Photoluminescence (PL) and cathodoluminescence (CL) spectroscopies have been performed on the ceramic sample. It is found that the PL spectral features are strongly dependent on the excitation wavelength. Remarkable PL spectral overlapping between bluish-green band and reddish-orange lines related to host defects/impurities and Sm ions, respectively, has been obtained. In addition, controlling the relative PL spectral contributions from the host-related emission and Sm ions has been achieved by changing the excitation wavelengths. This led to manipulate the emission color coordinates as investigated by chromaticity diagram. Moreover, under certain excitation wavelengths, an intense white emission is observed with a naked eye. The origin of the white emission has been discussed in light of specific PL spectral overlapping from the host and Sm ion contributions. This work emphasizes on the role played by the host defects/impurities in the optical properties of ceramic materials that can be exploited in several lighting applications.

这项工作首次报道了掺sa钇铝石榴石陶瓷，掺m YAG的光驱动白光发射。通过共沉淀法制备了掺Sm的YAG纳米晶样品，然后通过放电等离子烧结（SPS）技术通过烧结工艺将其转变为块状陶瓷。X射线衍射（XRD）和高分辨率透射电子显微镜（HRTEM）用于表征纳米晶体的晶体结构。通过扫描电子显微镜（SEM）证明了所获得的陶瓷的微晶。对陶瓷样品进行了光致发光（PL）和阴极发光（CL）光谱分析。发现PL光谱特征强烈依赖于激发波长。已获得分别与主体缺陷/杂质和Sm离子有关的蓝绿色带和红橙色线之间的显着PL光谱重叠。此外，通过改变激发波长，可以控制与主体相关的发射和Sm离子的相对PL光谱贡献。如色度图所示，这导致操纵发射颜色坐标。此外，在某些激发波长下，用肉眼观察到强烈的白色发射。已经根据特定的PL光谱与基质重叠以及Sm离子的贡献讨论了白色发射的起源。这项工作强调了主体缺陷/杂质在陶瓷材料的光学性能中所起的作用，可以在几种照明应用中加以利用。