Incorporation of Fluorene and Its Heterocyclic Spiro Derivatives To Realize High-Performance and Stable Sky-Blue-Emitting Arylgold(III) Complexes

A series
of arylgold­(III) complexes of tridentate diphenylpyridine
ligand incorporated with fluorene and its heterocyclic spiro derivatives,
spiro­[fluorene-9,9′-xanthene] and spiro­[acridine-9,9′-fluorene],
as auxiliary ligands has been prepared. This class of complexes exhibits
high decomposition temperatures of up to 387 °C, excellent film
morphologies in solid-state thin films with a root-mean-square roughness
smaller than 0.20 nm, as well as high photoluminescence quantum yields
of up to 0.72 in solid-state thin films. Solution-processed organic
light-emitting devices (OLEDs) fabricated from this series of complexes
as dopants show intense electroluminescence in the sky-blue region
with maximum external quantum efficiencies of 10.0%. Taking advantage
of their high thermal stability, vacuum-deposited OLEDs have also
been fabricated and satisfactory operational lifetimes of ∼300
h have been recorded.

本研究制备了一系列以芴及其杂环螺环衍生物（螺[芴-9,9′-氧杂蒽]、螺[吖啶-9,9′-芴]）修饰的三齿二苯基吡啶配体作为辅助配体的芳基金(III)配合物。该类配合物具备优异的热稳定性，热分解温度最高可达387 ℃；固态薄膜形貌优良，均方根粗糙度小于0.20 nm；同时固态薄膜的光致发光量子产率最高可达0.72。以该系列配合物作为掺杂剂制备的溶液加工型有机发光二极管（Organic Light-Emitting Diode，OLED），可在天蓝色发光区域展现出强烈的电致发光性能，最大外量子效率可达10.0%。依托该类配合物优异的热稳定性，研究人员同时制备了真空蒸镀型OLED，其器件工作寿命可达约300小时，性能表现令人满意。