Highly efficient Organic Light-Emitting Diodes from thermally activated delayed fluorescence using a sulfone–carbazole host material
Highly efficient Organic Light-Emitting Diodes from thermally activated delayed fluorescence using a sulfone–carbazole host material
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DOI：
10.1016/j.orgel.2014.10.049
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发表时间：
2015
影响因子：
3.2
通讯作者：
Michael P. Gaj;C. Fuentes-Hernandez;Yadong Zhang;S. Marder;B. Kippelen
中科院分区：
文献类型：
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作者：
Michael P. Gaj;C. Fuentes-Hernandez;Yadong Zhang;S. Marder;B. Kippelen
以新型双极性基质3，5-二（咔唑-9-基）-1-苯磺酰基苯（mCPO 2）为发光体，制备了热激活延迟荧光（TADF）发光体（4s，6s）-2，4，5，6-四（9 H-咔唑-9-基）苯甲腈（4CzIPN）有机电致发光器件。当掺杂在5重量%报道了具有大于81 cd/A的电流效率和26.5%的外量子效率的EL效率值的OLED。这些器件在10 cd/m2下具有3.2 V的低导通电压，以及在高电流密度下降低的效率滚降。据我们所知，这些是TADF OLED有史以来报道的最高效率之一，甚至与磷光OLED的最高报道效率相当。
Organic Light-Emitting Diodes (OLEDs) using the thermally activated delayed fluorescence (TADF) emitter (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN) are demonstrated using a novel ambipolar host 3,5-di(carbazol-9-yl)-1-phenylsulfonylbenzene (mCPSOB). When doped in a 5 wt.% concentration, OLEDs with EL efficiency values of more than 81 cd/A for current efficacy and 26.5% for external quantum efficiency are reported. These devices exhibit a low turn-on voltage of 3.2 V at 10 cd/m2, as well as reduced efficiency roll-off at high current densities. To the best of our knowledge, these are among the highest ever reported efficiencies for TADF OLEDs, and are even comparable to the highest reported efficiencies for phosphorescent OLEDs.