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Photophysical and electrochemical properties of 7,16-dihydroheptacenes (1–3) were investigated in detail. Although their HOMO–LUMO gaps are higher than 3 eV, the organic light-emitting diodes containing 1 as the emitting dopant showed green electroluminescence (λ max ∼515 and 550nm) even at a concentration of the dopant as low as 1%. The green electroluminescence of 1 appears to be originating...
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