SILICON-BASED BLUE-GREEN PHOSPHORESCENT MATERIAL OF WHICH LUMINESCENCE PEAK CAN BE CONTROLLED BY EXCITATION WAVELENGTH AND PROCESS FOR PRODUCING SILICON-BASED BLUE-GREEN PHOSPHORESCENT MATERIAL

摘要

Disclosed is a silicon-based blue phosphorescent material that has a longer luminescence service life, a high luminescence intensity, and excellent long-term stability and reproducibility.  Also disclosed is a process for producing a silicon-based blue-green phosphorescent material of which the luminescence peak can be controlled by an excitation wavelength.  The process is characterized by comprising a first step of anodizing the surface of silicon to prepare silicon having nano-scale crystallinity or silicon having nano-structure, a second step of subjecting the silicon to rapid thermal oxidation, and a third step of subjecting the silicon to high-pressure water vapor annealing.  The silicon-based blue-green phosphorescent is characterized by comprising a silicon oxide film and a number of silicon having nano-scale crystallinity or silicon having nano-structure embedded in the silicon oxide film, the silicon-based blue-green phosphorescent material having molecular energy inter-order transition properties through triplet excitons having a relaxation time of not less than 1 ms, or luminescence transition through a quasi-stable excited state or trap having a relaxation time of not less than 1 ms.