Highly efficient near ultraviolet organic light-emitting diode based on a meta-linked donor-acceptor molecule
Highly efficient near ultraviolet organic light-emitting diode based on a meta-linked donor-acceptor molecule
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基于元连接供体-受体分子的高效近紫外有机发光二极管
DOI：
10.1039/c5sc01131k
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发表时间：
2015-01-01
期刊：
影响因子：
8.4
通讯作者：
Ma, Yuguang
中科院分区：
文献类型：
--
作者：
Liu, Haichao;Bai, Qing;Ma, Yuguang
设计并合成了一种三苯胺（TPA）与菲并咪唑（PPI）间位连接的给体-受体（D-A）结构的新型近紫外发光材料mTPA-PPI。该分子设计有望解决D-A体系中无红移发射和引入电荷转移（CT）态之间的矛盾，实现高效率、高色纯度的NUV有机电致发光器件。理论计算和电子物理实验验证了mTPA-PPI独特的激发态性质。mTPA-PPI器件表现出优异的NUV电致发光（EL）性能，其发射峰在404 nm处，半高全宽（FWHM）仅为47 nm，对应于CIE坐标（0.161，0.049），最大外量子效率（EQE）为3.33%，这是NUV OLED的最佳结果之一。本工作不仅展示了mTPA-PPI在NUV OLED中的潜在应用前景，而且为利用间位连接的D-A结构合理设计NUV材料提供了有价值的策略。
A novel near ultraviolet (NUV) emitter with a meta-linked donor-acceptor (D-A) structure between triphenylamine (TPA) and phenanthroimidazole (PPI), mTPA-PPI, was designed and synthesized. This molecular design is expected to resolve the conflict between the non-red-shifted emission and the introduction of a charge-transfer (CT) state in the D-A system, aiming at NUV organic light-emitting diodes (OLEDs) with high-efficiency and colour-purity. Theoretical calculations and photophysical experiments were implemented to verify the unique excited state properties of mTPA-PPI. The mTPA-PPI device exhibited excellent NUV electroluminescence (EL) performance with an emission peak at 404 nm, a full width at half maximum (FWHM) of only 47 nm corresponding to a CIE coordinate of (0.161, 0.049), and a maximum external quantum efficiency (EQE) of 3.33%, which is among the best results for NUV OLEDs. This work not only demonstrates the promising potential of mTPA-PPI in NUV OLEDs, but also provides a valuable strategy for the rational design of NUV materials by using the meta-linked D-A architecture.