Adsorption of indole[3, 2-b]carbazole derivatives in the filter paper matrix to realize long-lived room temperature phosphorescence emission

Developing long-lived room temperature phosphorescence (RTP) organic materials through simple and effective strategy is of considerable practical significance in biological imaging, optoelectronics and sensors. However, achieving efficient RTP emission of organic chromophores is challenging because of the inefficient intersystem crossing (ISC), intensive nonradiative decay and susceptible triplet excited states. Here, we present an effective strategy to obtain RTP emission of indole[3, 2-b]carbazole derivatives via embedding the molecules in the filter paper matrix. Furthermore, t-BuOK play the role of "key" to open the close-knit hydrogen bonds of cellulose, and then the indole[3, 2-b]carbazole derivative molecules are trapped in the filter paper matrix to realize RTP emission. The present long-lived phosphorescent systems describe an effective strategy to trigger the RTP emission of organic chromophores.