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P‐140: High Efficient Anthracene‐Based Blue Light Emitting Material for OLED

The novel blue light emitting materials, 9,10‐Bis(9′,9′‐diethyl‐7′‐diphenylamino‐fluoren‐2‐yl)‐anthracene, which is composed of an anthracene as main unit and a rigid, bulky, easy hole transportable and energy transferable phenylamine substituted fluorene containing as side unit, was designed and synthesized. The theoretical calculation of 3 dimensional structure and the energy densities of HOMO and LUMO states, as well as optical properties of new obtained material, support that it has a non coplanar structure and that intramolecular energy transfer occurs from the side units to the main unit, resulting in high luminescent efficiency and high color purity. With the newly designed blue emitting material in the multilayer device structure, it was possible to achieve the luminous efficiency of 4.2 cd/A (3.3 % of quantum efficiency at 7.5V). The EL spectrum of the multilayer device showed a narrow emission band with full width at half maximum (fwhm) 53 nm and a λmax = 461 nm.