SPECIFIC FEATURES OF LUMINESCENCE OF Q-CDS COLLOIDS WITH DIFFERENT SIZES

The specific features of luminescence of colloidal solutions of Q-CdS with particles of different size and the regularities of luminescence quenching by quenchers of various nature were studied. The luminescenc e spectra of Q-CdS consist of several bands, which are shifted to the long-wave region as the particle size increases. The dependence of the integral quantum yield of luminescence on the particle size has a sha rp maximum at a particle diameter of -23 Angstrom. A Stern-Volmer-type equation including the adsorption isotherm of the quencher molecules on the surface of the Q-CdS colloidal particles was used to describe t he regularities of luminescence quenching of Q-CdS colloidal solutions . The CdS particle size was found to affect the efficiency of luminesc ence quenching. The regularities of luminescence quenching depend both on the rate constant of electron transfer to the quencher molecules a nd on the ability of the quencher molecules to be adsorbed on the surf ace of the CdS colloidal particle.