THEORY OF STARK SHIFTS IN QUANTUM-WELLS CONSISTING OF HIGHLY ANISOTROPIC MOLECULAR-CRYSTALLINE LAYERS

We introduce a simple model to calculate the Stark shift in multiple q uantum wells consisting of highly anisotropic and optically nonlinear molecular-crystalline layers. This model is used to calculate the exci ton absorption peak in quantum-well structures consisting of the arche type planar molecular compounds; 3,4,9,10-perylenetetracarboxylic dian hydride, 3,4,7,8-naphthalenetetracarboxylic dianhydride, ,4,9,10-peryl enetetracarboxylic-bis-benzimidazole, and copper phthalocyanine. We fi nd that the exciton absorption peak shifts by 60 to 70 meV in an elect ric field of < 10(6) V/cm. We also find that both redshifts and bluesh ifts are achieved for asymmetrical quantum-well structures.