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Superliner Photo Response in Colloids of Silicon Quantum Dots

Ujjwal Ghanta, Mallar Ray, Nil Ratan Bandyopadhyay, Syed Minhaz Hossain

In this work we have studied the photoluminescence (PL) properties of colloidal suspension of silicon quantum dots (QDs) surrounded by silicon oxide with 3.08 eV continuous wave (CW) laser and the effect of excitation power. The oxide coated silicon QDs shows strong visible PL at room temperature. The emission spectrum consists of two consecutive peaks in the visible region. A superliner increase in peak emission intensity accompanied by spectral narrowing of luminescent peak is observed. This phenomenon suggests the possibility of optical gain in the colloidal system.