All‐Organic, Temporally Pure White Afterglow in Amorphous Films Using Complementary Blue and Greenish‐Yellow Ultralong Room Temperature Phosphors,Advanced Functional Materials

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All‐Organic, Temporally Pure White Afterglow in Amorphous Films Using Complementary Blue and Greenish‐Yellow Ultralong Room Temperature Phosphors
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-23 , DOI: 10.1002/adfm.202003693
Suman Kuila ₁ , Swadhin Garain ₁ , Sreenivasulu Bandi ₁ , Subi J. George ₁

Affiliation

Organic molecules exhibiting afterglow emission (lifetime longer than 0.1 s) under ambient conditions have sparked tremendous attention in recent years as a sustainable energy source with potential applications in displays, lighting, and bioimaging. However, white afterglow organic materials with color purity during the entire period of delayed emission, after the cessation of excitation source, are yet to be achieved due to the different excited state lifetimes of its primary or complementary components. Herein, a remarkable, ambient “temporally pure white afterglow,” which lasts for over 7 s, by coorganizing complementary blue and greenish‐yellow organic room temperature phosphors with similar ultralong lifetimes and efficiency, in an amorphous polymer film is demonstrated. One of the most efficient blue afterglow room temperature phosphors is also reported, with an ultralong lifetime up to 2.26 s and maximum quantum efficiency of 36.8%, from purely organic triazatruxenes en route to the realization of this white afterglow. Further, broad and complementary absorption features of the coorganized phosphors in the visible region facilitates an excitation‐dependent dynamic color‐tuning of the afterglow from sky‐blue to greenish‐yellow.

中文翻译：

使用互补的蓝色和绿色黄色超长室温荧光粉在非晶膜中的全有机，临时纯白色余辉

近年来，在环境条件下表现出余辉发射（寿命长于0.1 s）的有机分子作为一种可持续的能源已引起了极大的关注，其在显示器，照明和生物成像方面的潜在应用。然而，由于其主要或互补成分的激发态寿命不同，在延迟发射的整个过程中，在停止激发源之后，具有白色纯度的白色余辉有机材料尚未实现。在本文中，通过在非晶态聚合物薄膜中组织互补的蓝色和带绿色的黄绿色有机室温荧光粉（具有相似的超长寿命和效率），持续了超过7 s的显着环境“暂时纯白色余辉”持续了7 s。从纯有机三氮杂戊烯到实现这种白色余辉的过程中，还报道了一种最高效的蓝色余辉室温荧光粉之一，其超长寿命可达2.26 s，最大量子效率为36.8％。此外，在可见光区域，有机磷的广泛和互补的吸收特征有利于余辉从天蓝色到黄绿色的激发依赖的动态颜色调谐。

更新日期：2020-09-18

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