Photoluminescent and electroluminescent properties and ultra-fast spectrometric studies of dihydroheptacenes

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• 作者：Rajib Mondal ; Brigitte Wex ; Bipin K. Shah ; Bilal R. Kaafarani ; Evgeny O. Danilov ; Ghassan E. Jabbour ; Douglas C. Neckers
• 关键词：Dihydroheptacenes ; Photoluminescence ; Electroluminescence ; Excimer ; Electromer
• 刊名：Organic Electronics
• 出版年：2008
• 出版时间：April 2008
• 年：2008
• 卷：9
• 期：2
• 页码：227-233
• 全文大小：523 K

文摘

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 550 nm) even at a concentration of the dopant as low as 1 % . The green electroluminescence of 1 appears to be originating from an electromeric state (an intermolecular ion pair). The maximum brightness of 190 cd/m² was observed at a current density of 34 mA/cm² at operating voltage of 19 V for the device containing 1 % 1, and overall performance of the devices decreased with an increase in the doping concentration of 1.