摘要
采用连续变化的单色光作为激发光源，测量了多孔硅的光致发光（ＰＬ）谱和光致发光激发（ＬＰＥ）谱．结果表明，多孔硅存在两种不同的ＰＬ谱．一种是人们通常观察到的ＰＬ谱，其峰位可随多孔硅量子尺寸的变小以及激发光波长（λｅｘ）的变短而蓝移，我们称其力量子限制型光致发光（ＱＰＬ）谱．另一种是其峰位波长处于蓝紫光范围且峰位基本上不随多孔硅的量子尺寸和λｅｘ而变化的ＰＬ谱，我们称其为非量子限制型光致发光（ＮＱＰＬ）谱．多孔硅还存在与ＰＬ谱相对应的两种不同的ＰＬＥ谱．与ＱＰＬ谱对应的ＰＬＥ谱是双峰谱，与ＮＱＰＬ谱对应的ＰＬＥ谱不是双峰谱．因此，多孔硅中同时存在两种不同的发光机理．
Abstract The photoluminescence (PL) spectra and photoluminescence excitation (PLE)spectra of porous silicon have been measured by using continuously adjustable monochromatic light as excitation source. The results show that there are two kinds of different PL spectra in porous silicon. One is the commonly observed PL spectrum.Its peak wavelength gets shorter as the sizes of quantum dots(or wires) of porous silicon and the excitation wavelength (λex) diminish.The other is the spectrum that its peak wavelength does not change with the quantum sizes of porous silicon and the excitation wavelength.Moreover,there are two kinds of PLE spectra related to the two kinds of PL spectra.Therefore,there are two kinds of different photoluminescence mechanism in the porous silicon.
基金
国家自然科学基金
江西省自然科学基金
