Organic/inorganic superlattices with ordered organic layers

Abstract

Superlattices consisting of alternating layers of organic and inorganic materials have been fabricated from 3,4,9,10-perylenetetracarboxylic diimide (PTCDI), copper phthalocyanine (&PC), and MgF, by molecular-beam deposition. From the small-angle x-ray diffraction patterns of PTCDVMgF, and CuPc/MgFz superlattices, a periodically layered structure is confirmed through the entire stack. The PTCDI layers in the PTCDVMgF, superlattices have a high degree of structural ordering, in which molecular planes are nearly parallel to the substrate surface. On the other hand, the CuPc/MgF2 superlattices have a poorly ordered structure in the CuPc layers. It is found that the optical absorption spectra of these superlattices are different from those of organic single films and significantly change with varying organic layer thickness. Such spectral changes can be interpreted by the effect of the aggregate size and the coexistence of two different crystal forms. 0 1995 American Institute of Phy+cs.

Crystallochromy of perylene pigments: Interference between Frenkel excitons and charge-transfer states

“…The optical absorbance of PTCDI shows a fairly large broadening of the lowest subband with a full width at half maximum corresponding roughly to the energy of the calculated effective internal mode of 0.175 eV, compare Table III, 62 indicating rather large elongations of external librational phonons after optical excitation.…”

Studies on the Electrical and Optical Properties of Magnesium Phthalocyanine Thin Films

“…12 Recently superlattices consisting of organic multilayers have been demonstrated in some combinations of organic materials. 13 The photoionization energies of MgPc and CuPc single crystals have been determined in different ambient atmospheres by electrostatic method.…”

Efficient white light emitting devices with a blue emitting layer doped with a red dye

“…White light emission is obtained by mixing two complementary colors (e.g., blue and orange) or three primary colors (red, green, and blue) from different emitting molecules. This can be done either using a multilayer structure with two or more emitting layers or doping an active host material with several fluorescent dyes [2][3][4][5][6][7][8][9][10][11]. In devices with multiple light emitting layers, a hole-or electronblocking layer of appropriate thickness is often inserted between emissive layers in order to control the amount of exciton formation in each layer, thereby producing light emission from each layer.…”