Current Injection Pumping of Organic Light Emitters

The use of thin films of phthalocyanines as current pumped light emitters was investigated. The growth of phthalocyanine films in a stacked ring crystal structure offers the potential for introduction of electronic structure modulation in the film which could lead to charge carrier confinement and resultant optical emission. Heteroepitaxial stacked ring crystal structures could only be grown to a film thickness of 5 nanometers however. The metal phthalocyanines studied for this growth included copper, magnesium, iron, zinc, fluorochromium, sodium, dichlorosilicon and dilithium. Exposure of ordered films to dopant gases of iodine and bromine affected the crystal structure of the films. the modulated film structures grown did not exhibit fluorescence upon current injection. These films could not be grown in the heteroepitaxial, stacked ring crystal structure which is critical to achieve novel electronic structure modulation. The use of ion beam assist to enhance formation of cofacially joined SiPcO film growth is suggested as a way to enhance heteroepitaxial film growth to greater thickness. These materials are being studied because of their potential as light emitting diodes and laser diodes tunable by chemical means. Devices of these materials are anticipated to have application as integrated optical components. Keywords: Semiconductor device. (AW)