Color-tunable ultralong organic phosphorescence materials for visual UV-light detection
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tps://doi.org/10.1007/s11426-020-9761-x
SPECIAL ISSUE: 2020 Emerging Investigator Issue
Color-tunable ultralong organic phosphorescence materials for visual UV-light detection 1†
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Lifang Bian , Huili Ma , Wenpeng Ye , Anqi Lv , He Wang , Wenyong Jia , Long Gu , 1 1* 1,2 Huifang Shi , Zhongfu An & Wei Huang 1 2
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 211816, China; Frontiers Science Center for Flexible Electronics (FSCFE), Shaanxi Institute of Flexible Electronics (SIFE) & Shaanxi Institute of Biomedical Materials and Engineering (SIBME), Northwestern Polytechnical University (NPU), Xi’an 710072, China Received March 12, 2020; accepted April 26, 2020; published online May 26, 2020
Ultralong organic phosphorescence (UOP) materials have roused considerable attention in the field of photonics and optoelectronics owing to the feature of long-lived emission lifetimes. However, to develop UOP materials with color-tunability is still a formidable challenge. Here, we report a class of UOP materials containing carbonyl, amino or amide groups, exhibiting colortunable persistent luminescence ranging from blue (458 nm) to yellow-green (508 nm) under different UV wavelength excitation. Taken theoretical and experimental results together, we conclude that the excitation dependent color-tunable UOP emission is ascribed to multiple emission centers from single molecular and aggregated states in crystal. Given color-tunable UOP feature, these materials are used to successfully realize visual UV-light detection. This finding not only provides a strategy to design new organic phosphorescent molecules with colorful emission, but also extends the scope of the applications of purely organic phosphorescent materials. color tunability, room temperature phosphorescence, excitation dependent emission, persistent luminescence, UV-light detection Citation:
Bian L, Ma H, Ye W, Lv A, Wang H, Jia W, Gu L, Shi H, An Z, Huang W. Color-tunable ultralong organic phosphorescence materials for visual UVlight detection. Sci China Chem, 2020, 63, https://doi.org/10.1007/s11426-020-9761-x
1 Introduction Ultraviolet light (UV-light) has utility in sterilization, identification, health and medicine, etc., but excessive ultraviolet light will cause great harm to the human skin, eyes and immune system, such as skin cancer, cataract and other diseases. Generally, UV-light (10–380 nm) is divided into two wavelength ranges: 10–200 nm is known as the far UV region; while 200–380 nm is referred to as the near UV region. However, UV light is invisible to the naked eyes, which makes a strong obstacle to prevent UV-light damage. At present, UV-light detection mainly relies on semiconductor †These authors contributed equally to this work. *Corresponding author (email: [email protected])
UV photodetectors by transforming UV radiation signals to electronic signals [1–5]. However, these detectors usually involve complicated procedures, expensive materials and inst
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