THEORETICAL INVESTIGATION OF EXCITONIC SURFACE-STATES IN MULTILAYER ORGANIC QUANTUM-WELLS - RADIATIVE DECAY-RATES OF THE FIRST AND 2ND SURFACE EXCITONS

A theory of excitonic surface states in multilayer organic quantum wel ls is developed beyond the nearest-neighbor approximation. Eigenenergi es and envelope functions of eigenstates of several kinds of surface s tates as well as band states are obtained, and the characteristics of surface states are clarified. The difference in super-radiant decay ra tes of the first and second surface excitons can be explained in the f ramework of the present theory. The results of numerical calculations are compared to the experimental data for two-dimensional Frenkel exci tons in anthracene crystals.