SrS∶HoF_3薄膜的电致发光机制

ELECTROLUMINESCENT MECHANISM IN SrS∶HoF 3 THIN FILM

研究了ＳｒＳ∶ＨｏＦ３薄膜的光谱特性，分析了光谱与驱动电压的关系，认为ＳｒＳ∶ＨｏＦ３薄膜电致发光不是以直接碰撞激发机制为主；方波脉冲激发下没有看到下降沿发光的现象，可能不存在发光中心离化的过程．比较ＳｒＳ∶ＨｏＦ３薄膜的电致发光与光致发光光谱，认为过热电子碰撞激发基质晶格。

Abstract The spectral characteristics of SrS∶HoF 3 thin films are investigated.The aim is to analyse the electroluminescent(EL) mechanism in the SrS∶HoF 3 thin film.Direct impact excitation mechanism is not the main excitation mechanism according to the relation between the EL spectra and the applied voltage.The ionization of the luminescent center could not happen because there is no trailing edge emission when the thin film is driven by square voltage.Comparing the EL and photoluminescent(PL) spectra,we think the main excitation mechanism is that the hot electrons impact and excite the host and then their energy is transferred to the luminescent centers.