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首页> 外文期刊>Journal of Materials Chemistry, C. materials for optical and electronic devices >Highly efficient phosphorescent organic light-emitting diodes based on novel bipolar iridium complexes with easily-tuned emission colors by adjusting fluorine substitution on phenylpyridine ligands
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Highly efficient phosphorescent organic light-emitting diodes based on novel bipolar iridium complexes with easily-tuned emission colors by adjusting fluorine substitution on phenylpyridine ligands

机译：通过调节苯吡啶配体上的氟取代，基于新型双极铱配合物的高效磷光有机发光二极管，通过调节苯吡啶配体上的氟取代

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摘要

Two new phenylpyridine derivative-based heteroleptic iridium complexes, (Fppy)(2)Ir(dipg) (Fppdg) and (CF(3)ppy)(2)Ir(dipg) (tFmppdg) with emission peaks of 545 nm and 581 nm, respectively, were designed and synthesized by incorporation of a dipg group (N,N '-diisopro-guanidinate) as the ancillary ligand. Their photophysical, thermal, electrochemical and electroluminescence properties were investigated. The results indicate that the emitting color of phosphorescent complexes can be tuned easily by adjusting their F/CF3-substituted cyclometalated ligands. Simultaneously, Fppdg and tFmppdg show good thermal stabilities, short lifetimes of the triplet state and high photoluminescence quantum yields. More importantly, their almost complete spatial separation of HOMO and LUMO distributions endows both phosphors with an amazing bipolar charge transporting ability, and thus the corresponding doped OLEDs possess desirable concentration-independent and negligible efficiency roll-off features: at a rather wide concentration range of 8-25% doped in the CBP host, both phosphors realize a very high peak external quantum efficiency (EQE) level of >20%, and maintain values of >18% at a practical luminance of 1000 cd m(-2).
机译：设计并合成了两种新的基于苯基吡啶衍生物的异轻铱配合物（Fppy）（2）Ir（dipg）（Fppdg）和（CF（3）ppy）（2）Ir（dipg）（tFmppdg），其发射峰分别为545nm和581nm，并引入了dipg基团（N，N'-二异丙基胍酸盐）作为辅助配体。研究了它们的光物理、热、电化学和电致发光性能。结果表明，通过调节F/CF3取代的环金属化配体，可以很容易地调节磷光配合物的发光颜色。同时，Fppdg和tFmppdg表现出良好的热稳定性、短的三重态寿命和高的光致发光量子产率。更重要的是，它们对HOMO和LUMO分布几乎完全的空间分离赋予了这两种磷光体惊人的双极电荷传输能力，因此相应的掺杂OLED具有理想的浓度无关且可忽略的效率衰减特性：在CBP主体中掺杂8-25%的相当宽的浓度范围内，这两种荧光粉都实现了>20%的极高峰值外部量子效率（EQE）水平，并在1000 cd m（-2）的实际亮度下保持>18%的值。

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