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- W1978658032 abstract "We report effective enhancement of external quantum efficiency of phosphorescent organic light-emitting devices (OLEDs) with facially encumbered and bulky <i>meso</i>-aryl substituted Pt(II) porphyrins, probably suppressing non-radiative deactivation. The peak external quantum efficiencies (QEs) of the phosphorescent OLEDs with facially non-encumbered Pt(II) porphyrin <b>1</b>, facially encumbered Pt(II) porphyrin <b>2</b>, Pt(II) porphyrin <b>3</b> that bears bulkier 3,5-di-tert-butylphenyl substituents, and doubly-decamethylene-strapped Pt(II) porphyrin <b>4</b> were 1, 4.2, 7.3, and 8.2 %, respectively. The trend increasing performance in the order of <b>1</b> < <b>2</b> < <b>3</b> < <b>4</b> is related to facial encumbrance and steric bulkiness of Pt(II) porphyrins. Furthermore, in the case of Pt(II) porphyrin <b>4</b>, it is considered that the double straps severely restrict rotational freedom of the <i>meso</i>-aryl substituents. The lifetimes for Pt(II) porphyrins <b>1</b>-<b>4</b> at a current density of 0.55 mA/cm<sup>2</sup> were 80, 103, 140, and 152 <i>μ</i>s, respectively. The trend that the triplet lifetime becomes longer in the order of <b>1</b> < <b>2</b> < <b>3</b>, <b>4</b> suggests that facial encumbrance and steric bulkiness suppress non-radiative deactivation. The triplet lifetimes of Pt(II) porphyrins <b>1</b>-<b>4</b> were all gradually shortened with increasing current densities, suggesting possible triplet-triplet annihilation and/or triplet-charge carrier recombination." @default.
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- W1978658032 date "2005-08-18" @default.
- W1978658032 modified "2023-09-26" @default.
- W1978658032 title "Highly efficient red phosphorescent organic light-emitting devices with facially encumbered and bulky Pt(II) porphyrins" @default.
- W1978658032 doi "https://doi.org/10.1117/12.614708" @default.
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