White organic/polymer light emitting diode (WOLED/WPLED) processed from solution has attracted significant research interest in recent years due to their low device production cost, device flexibility, easy fabrication over large area including roll to roll and ability to print in various designs and shapes providing enormous design possibilities. Although WOLEDs fabricated using solution process lack their thermally evaporated counterparts in terms of device efficiency, remarkable progress has been made in this regard in recent years by utilizing new materials and device structures. In the present review, we have summarized and extrapolated an excellent association of old and modern concept of cost-effective materials and device structure for realization of white light. In particular, this article demonstrated and focused on design, and development of novel synthesis strategy, mechanistic insights and device engineering for solution process low cost WOLEDs device. Herein, an overview of the prevailing routes towards white light emitting devices (WLEDs) and corresponding materials used, including polymer based WLED, small molecules emitters based thermally activated delayed fluorescence (TADF), perovskite light-emitting diodes (PeLEDs) and hybrid materials based LEDs, color down-converting coatings with corresponding best efficiencies ever realized. We presume that this exhaustive review on WLEDs will offer a broad overview of the latest developments on white SSL and stonework the approach en route for innovations in the immediate future.

中文翻译：

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基于纯有机荧光到现代热激活延迟荧光（TADF）和钙钛矿材料的白光发光二极管。

由溶液加工而成的白色有机/聚合物发光二极管（WOLED/WPLED）由于器件生产成本低、器件灵活性、易于大面积制造（包括卷对卷）以及以各种设计进行打印的能力，近年来引起了人们的广泛研究兴趣和形状提供了巨大的设计可能性。尽管使用溶液工艺制造的 WOLED 在器件效率方面缺乏热蒸发同类器件，但近年来通过利用新材料和器件结构，在这方面取得了显着进展。在本次综述中，我们总结并推断了实现白光的高性价比材料和器件结构的旧概念和现代概念的完美结合。特别是，本文展示并重点介绍了溶液工艺低成本 WOLED 器件的新型合成策略、机理见解和器件工程的设计和开发。本文概述了白光发射器件 (WLED) 和所使用的相应材料的主流路线，包括基于聚合物的 WLED、基于小分子发射器的热激活延迟荧光 (TADF)、钙钛矿发光二极管 (PeLED) 和基于混合材料的LED、颜色下转换涂层具有迄今为止实现的最佳效率。我们认为，这篇关于 WLED 的详尽回顾将为白光 SSL 的最新发展提供广泛的概述，并为不久的将来的创新之路提供一个全面的概述。