Study of properties on non-protected room temperature phosphorescence and delayed excimer fluorescence of pyrene solution

A strong and stable room temperature phosphorescence (RTP) and delayed exci mer fluorescence signal located at 596 and 475 nm, respectively, can be ind uced for pyrene solution in the absence of any protective medium only use K I or TINO3 as a heavy atom perturber (HAP) and Na2SO3 as a deoxygenator. Bo th lifetimes of RTP and the delayed fluorescence are in the order of X-ms a nd the intensities are changed with kind and amount of HAP, but the peak po sitions are same and there is a iso-luminescent point in the emission spect ra corresponding to emission at 475 nm and at 596 nm. The optimum condition s and the effects of kind and amount of HAP and organic solvents on lumines cence properties of pyrene solution were studies in detail, and the photoph ysical process in the presence of KI or TlNO3 for phosphorescence and delay ed excimer fluorescence emission of pyrene solution was discussed. (C) 2001 Elsevier Science B.V. All rights reserved.