Effect of laser illumination on the blue-green luminescence from MCM-41 at room temperature

Abstract

The effect of laser illumination on the luminescent properties of MCM-41 was investigated by photoluminescence (PL) measurements. It was found that PL peak energy, PL intensity, and PL degradation of MCM-41 can be manipulated by controlling the laser illumination time. Laser illumination on MCM-41 gave at least a 2.5 times increase in PL intensity and an improvement in PL degrading phenomena. Possible mechanisms were proposed to explain our experimental results in a consistent way. The results presented here are expected to be useful for clarifying the nature of light emission from MCM-41 materials and to be of practical use for its possible applications in optical devices.

White Light Emission from Mesoporous Carbon–Silica Nanocomposites

“…5(c). The former band structure is almost similar to the reported visible PL form defective silica materials such as silica gels, 15) sol-geldelivered mesoporous silica, [16][17][18][19] amorphous silica nanoparticles, 20) and silica nanowires. 21) Although the detailed luminescent mechanisms of these materials are still unclear, several possible mechanisms stemming from SiO 2 structural defect sites were proposed to explain the PL phenomena.…”