The design and preparation of metal-free organic materials that exhibit room-temperature phosphorescence (RTP) is a very attractive topic owing to potential applications in organic optoelectronic devices. Herein, we present a facile approach to efficient and long-lived organic RTP involving the doping of N-phenylnaphthalen-2-amine (PNA) or its derivatives into a crystalline 4,4'-dibromobiphenyl (DBBP) matrix. The resulting materials showed strong and persistent RTP emission with a quantum efficiency of approximately 20% and a lifetime of a few to more than 100 milliseconds. Bright white dual emission containing blue fluorescence and yellowishgreen RTP from the PNA-doped DBBP crystals was also confirmed by Commission Internationale de l' Eclairage (CIE) coordinates of (x = 0.29-0.31, y = 0.38-0.41).
1.Jilin Univ, Coll Chem, State Key Lab Supramol Struct & Mat, 2699 Qianjin Ave, Changchun 130012, Peoples R China 2.Kaneka Amer Holding Inc, Kaneka US Mat Res Ctr KMR, 800 Raymond Stotzer Pkwy,Suite 2105, College Stn, TX 77843 USA 3.Chinese Acad Sci, Key Lab Organ Solids, Inst Chem, Beijing 100190, Peoples R China