As graphene is sculptured into quantum dots, confinement and edge effects induce a finite energy gap trigger exotic photoluminescent behavior. However, synthesis of dots (GQDs) with high fluorescence yield designated emission color remains challenging, due to lack knowledge in the exact influences various structural chemical factors. Herein, we explore optical absorption GQDs surface functional...

The temperature dependence of the ECL emission yield, @ECL, of Ru(bpy)?+ in acetonitrile has been determined and was found to correlate closely with the luminescence quantum yield, @ e , of the lowest R~(bpy) ,~+ dn* metal-to-ligand charge transfer (MLCT) excited state. Evidence is presented that at low temperatures (< -30 "C) the ECL emission yield becomes equal to the luminescence quantum yie...

Mixtures of 0 3 with excess N 2 0 were photolysed in the wavelength region 290 — 335 nm using monochromatic light with a band width of 4 nm. The resulting primary product atomic singlet oxygen, 0 ( 1 D ) , in reacting with N 2 0 produces in part NO which subsequently reacts with 0 3 giving rise to a weak infrared chemiluminescence. The emission was monitored with a cooled photomultiplier. The e...

...................................................................................................................... iii CHAPTER 1: BACKGROUND OF QUANTUM DOTS...................................................1 1.1 What Are Quantum Dots ................................................................................1 1.2 Fluorescence and Fluorescence Sensing......................................

Semiconductor quantum well electroabsorption modulators are widely used to modulate near-infrared (NIR) radiation at frequencies below 0.1 terahertz (THz). Here, the NIR absorption of undoped quantum wells was modulated by strong electric fields with frequencies between 1.5 and 3.9 THz. The THz field coupled two excited states (excitons) of the quantum wells, as manifested by a new THz frequenc...