Abstract
A series of hyperbranched copolymer system (P1, P2, P3 and P4) with tris[1-phenylisoquinolinato-C2,N]iridium(III) (Ir(piq)3) as the red emission core, fluorenone (FO) as the green emission unit and poly(9,9-dioctylfluorene) (PFO) as the blue emission branches was designed and synthesized, in which the balanced emission of red-, green- and blue-light was realized by adjusting the contents ratio of Ir(piq)3 and FO. These hyperbranched copolymers showed high fluorescence quantum efficiency (28.1%–47.2% in neat films) and excellent thermal stabilities. Furthermore, triplet-triplet annihilation was effectively suppressed by this hyperbranched structure. As a result, a high color rendering index (CRI) of 87 and a Commission International de l'Eclairage (CIE) coordinate of (0.31, 0.33) were achieved for P2 (0.05 mol% FO and 0.1 mol% Ir(piq)3)-based single-active-layer OLED device, which shows a maximum current efficiency of 3.85 cd A−1 and a maximum brightness of 3354 cd m−2 (at 10.9 mA cm−2).
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