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A comparative photophysical study of several new dendrimers consisting of the ethynylphenyl core and carbazole dendrons ( 1 − 5 ) is presented. Dilute solutions of 1 − 5 show intense blue emission in dichloromethane (λ max = 410−438 nm, Φ F = 0.53−0.91, τ F = 2.09−3.91 ns). The solvatochromic and solid-state emission behavior of 1 − 5 (λ max = 426−443 nm, Φ F = 0.30−0.90) is discussed. The geometry of 5 allows formation of a strong electromeric state, which was not the case with 1, indicating that the ethynylphenyl group can be used to tune dendrimer electroluminescence (EL) properties. An organic light-emitting diode (OLED) consisting of 1 as the emitting layer showed blue emission (CIE: 0.28, 0.20), whereas the EL of 5 (CIE: 0.34, 0.36) was found to be close to ideal white light. White OLEDs consisting of 5 as the emitting layer showed a maximum brightness of 450 cd/m 2 and a maximum efficiency of 0.11 cd/A at 11 V.
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Adhikari et al. (2009) studied this question.
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