Abstract Single-component white light materials excited by UV have great potential in the field of white LED (WLED) for avoiding the harm of the blue chip and the self-absorption between multi-components. However, the luminous efficiency (LE) of UV-driven WLED based on single-component material is always lower than 15 lm/W. Herein, branched polymers (HPF-PMs and SPF-PMs) with different topology structures (hyperbranched and star-shaped ones) have been synthesized by employing phenylmaleimide (PM) as core unit, and oligomer of fluorene (OF) as arm unit. Both of them exhibit strong yellow emission of PM in neat films with quantum yield up to 92%, due to complete energy transfer (ET) from OF to PM. Interestingly, HPF-PMs and SPF-PMs show dual-emissive white light in silica gel films for incomplete ET. White emission of the composite films can be adjusted by changing loading amount of copolymer, and introducing a green-emissive arylmaleimide core. When the blend films applied in LEDs based on UV chip, highly efficient white electroluminescence with the LE of 16-48 lm/W, and CIE close to (0.33, 0.33) can be realized through down-conversion.

中文翻译：

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通过芳基马来酰亚胺基支化聚合物的下转换，紫外驱动混合 LED 的高效白光发射

摘要 紫外激发的单组分白光材料在避免蓝光芯片的危害和多组分之间的自吸收方面在白光LED（WLED）领域具有巨大的潜力。然而，基于单组分材料的紫外线驱动 WLED 的发光效率 (LE) 始终低于 15 lm/W。在此，以苯基马来酰亚胺（PM）为核心单元，芴（OF）低聚物为臂单元，合成了具有不同拓扑结构（超支化和星形）的支化聚合物（HPF-PMs和SPF-PMs）。由于从 OF 到 PM 的完全能量转移 (ET)，它们都在纯薄膜中表现出强烈的 PM 黄色发射，量子产率高达 92%。有趣的是，HPF-PM 和 SPF-PM 在硅胶薄膜中显示出不完全 ET 的双发射白光。复合膜的白光发射可以通过改变共聚物的负载量和引入绿色发射芳基马来酰亚胺核来调节。当混合薄膜应用于基于UV芯片的LED时，可以通过下转换实现LE为16-48 lm/W，CIE接近(0.33, 0.33)的高效白电致发光。