用真空蒸发沉积的方法制备了纳米稀土(La、Nd、Sm)粒子-BaO介质薄膜.研究表明薄膜的光电发射光谱响应阈值受纳米稀土粒子形状和大小的影响,球形纳米稀土(Sm)粒子-BaO介质薄膜的光谱响应阈值波长为720nm,条状纳米稀土(La和Nd)粒子-BaO介质薄膜阈值波长分别为650nm和660nm.研究得到纳米稀土粒子-介质薄膜等效界面位垒高度在1.7～2.0eV之间.由于纳米稀土粒子与BaO介质各自逸出功不同,当构成薄膜后使得纳米粒子周围的空间电荷分布发生变化,纳米粒子周围的能带发生弯曲. Nanocrystalline rare earth (La, Nd, Sm) -BaO thin films were prepared by vacuum evaporation deposition.The results show that the threshold value of the photoemission spectra of the films is affected by the shape and size of the rare earth nanoparticles, and the spherical rare earth (Sm) The threshold wavelength of the spectral response of BaO thin film is 720 nm and the threshold wavelength of BaO thin film is 650 nm and 660 nm, respectively.It is found that the equivalent barrier height of the rare earth-dielectric thin film is 1.7 ~ 2.0eV. Due to the different work function of the nano-rare earth particles and the BaO medium, the energy distribution around the nano particles changes when the thin film is formed, and the energy band around the nano particles is bent.