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27 February 2002 Electroluminescence of bipolar tetraphenylmethane-based molecular materials
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Bipolar p-TPAOXD and m-TPAOXD are both tetraphenylmethane- based isomeric compounds containing triphenylamine- substituted 1,3,4-oxadizaole moieties. Two are amorphous materials showing no melting or crystallization transition but only glass transition at 187 and 149 degree(s)C, respectively. Single-layer organic light-emitting devices based on p-TPAOXD or m-TPAOXD as active layer were fabricated via spin-casting method. With varied fabrication conditions (solvent, cathode material, and film thickness) devices with turn-on voltage as low as 4V, blue electroluminance with intensity of 1,700 cd/m2, and photometric efficiency larger than 0.7 cd/A can be achieved for p-TPAOXD. The luminance and photometric efficiency of the device containing m-TPAOXD are low (always less than 100 cd/m2 and 0.2 cd/A) as compared to those containing p- TPAOXD.
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Rong-Ho Lee, Hsiu-Chih Yeh, and Chin-Ti Chen "Electroluminescence of bipolar tetraphenylmethane-based molecular materials", Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002);

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