High photoluminescence quantum efficiency (PLQY) and simple molecular structure in a full-color emitting material system are two crucial issues for cost-effective multicolor display applications. Herein, a new tailor-made fluorescent core (pyrido[2,3-b]pyrazine) is designed and synthesized. Through systematically fine-tuning the band gap, the versatile pyrido[2,3-b]pyrazine family exhibits a wide range of emissions spanning the entire visible region from blue to red. By reasonable choice of donor units, two thermally activated delayed fluorescence (TADF) molecules are obtained and the resulting OLEDs exhibit a yellow emission and an orange emission with high EQEs of up to 20.0% and 15.4%, respectively.

中文翻译：

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基于吡啶并[2,3-b]吡嗪的全色荧光材料，用于高性能OLED

全色发射材料系统中的高光致发光量子效率（PLQY）和简单的分子结构是具有成本效益的多色显示应用的两个关键问题。在此，设计并合成了一种新的定制荧光灯芯（吡啶并[2,3- b ]吡嗪）。通过系统地微调带隙，通用的吡啶并[2,3- b ]吡嗪家族在从蓝色到红色的整个可见光区域内显示出广泛的发射范围。通过合理选择供体单元，可以获得两个热激活的延迟荧光（TADF）分子，所得的OLED分别显示出黄色发光和橙色发光，其EQE分别高达20.0％和15.4％。