Journal ArticleDOI
Visible-Light-Excited Ultralong Organic Phosphorescence by Manipulating Intermolecular Interactions
Suzhi Cai,Huifang Shi,Huifang Shi,Jiewei Li,Long Gu,Yun Ni,Zhichao Cheng,Shan Wang,Wei-wei Xiong,Lin Li,Zhongfu An,Wei Huang,Wei Huang +12 more
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TLDR
A concise chemical approach is provided to obtain bright UOP by tuning the molecular packing in the solid state under irradiation of available visible light, e.g., a cell phone flashlight under ambient conditions (room temperature and in air).Abstract:
Visible light is much more available and less harmful than ultraviolet light, but ultralong organic phosphorescence (UOP) with visible-light excitation remains a formidable challenge. Here, a concise chemical approach is provided to obtain bright UOP by tuning the molecular packing in the solid state under irradiation of available visible light, e.g., a cell phone flashlight under ambient conditions (room temperature and in air). The excitation spectra exhibit an obvious redshift via the incorporation of halogen atoms to tune intermolecular interactions. UOP is achieved through H-aggregation to stabilize the excited triplet state, with a high phosphorescence efficiency of 8.3% and a considerably long lifetime of 0.84 s. Within a brightness of 0.32 mcd m-2 that can be recognized by the naked eye, UOP can last for 104 s in total. Given these features, ultralong organic phosphorescent materials are used to successfully realize dual data encryption and decryption. Moreover, well-dispersed UOP nanoparticles are prepared by polymer-matrix encapsulation in an aqueous solution, and their applications in bioimaging are tentatively being studied. This result will pave the way toward expanding metal-free organic phosphorescent materials and their applications.read more
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Journal ArticleDOI
The influence of the molecular packing on the room temperature phosphorescence of purely organic luminogens.
Jie Yang,Xu Zhen,Bin Wang,Xuming Gao,Zichun Ren,Jiaqiang Wang,Yujun Xie,Jian-Rong Li,Qian Peng,Kanyi Pu,Zhen Li +10 more
TL;DR: It is found that strong π–π interactions in solid state can promote the persistent RTP and CS-CF3 shows the unique photo-induced phosphorescence in response to the changes in molecular packing, further confirming the key influence of the molecular packing on the RTP property.
Journal ArticleDOI
Enhancing the performance of pure organic room-temperature phosphorescent luminophores
Kenry,Chengjian Chen,Bin Liu +2 more
TL;DR: This Review discusses the fundamental mechanism of RTP in pure organic Luminophores, followed by design principles, enhancement strategies, and formulation methods to achieve highly phosphorescent and long-lived organic RTP luminophores even in aqueous media.
Journal ArticleDOI
Ultralong room temperature phosphorescence from amorphous organic materials toward confidential information encryption and decryption.
Yan Su,Soo Zeng Fiona Phua,Youbing Li,Xianju Zhou,Deblin Jana,Guofeng Liu,Wei Qi Lim,Wee Kong Ong,Chaolong Yang,Chaolong Yang,Yanli Zhao +10 more
TL;DR: A rational design for minimizing the vibrational dissipation of pure amorphous organic molecules to achieve URTP is presented and a new green screen printing technology without using any ink was developed toward confidential information encryption and decryption.
Journal ArticleDOI
Assembling-Induced Emission: An Efficient Approach for Amorphous Metal-Free Organic Emitting Materials with Room-Temperature Phosphorescence
TL;DR: A new concept as "Assembling-Induced Emission", the key thought of which systems is "control molecular motions, then control emission" via supramolecular dynamic assembling, is proposed, applicable in many emissive assembling systems besides such amorphous RTP materials introduced.
Journal ArticleDOI
Facile, Quick, and Gram-Scale Synthesis of Ultralong-Lifetime Room-Temperature-Phosphorescent Carbon Dots by Microwave Irradiation.
TL;DR: A facile, quick and gram-scale method for the preparation of ultralong RTP (URTP) carbon dots (CDs) was developed via microwave-assisted heating of ethanolamine and phosphoric acid aqueous solution and potential applications in the fields of anti-counterfeiting and information protection are proposed and demonstrated.
References
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Journal ArticleDOI
Highly efficient organic light-emitting diodes from delayed fluorescence
Hiroki Uoyama,Kenichi Goushi,Kenichi Goushi,Katsuyuki Shizu,Hiroko Nomura,Chihaya Adachi,Chihaya Adachi +6 more
TL;DR: A class of metal-free organic electroluminescent molecules in which the energy gap between the singlet and triplet excited states is minimized by design, thereby promoting highly efficient spin up-conversion from non-radiative triplet states to radiative singlet states while maintaining high radiative decay rates.
Journal ArticleDOI
Stabilizing triplet excited states for ultralong organic phosphorescence
Zhongfu An,Chao Zheng,Ye Tao,Runfeng Chen,Huifang Shi,Ting Chen,Zhixiang Wang,Huanhuan Li,Renren Deng,Xiaogang Liu,Wei Huang +10 more
TL;DR: A fundamental principle to design organic molecules with extended lifetimes of excited states is outlined, providing a major step forward in expanding the scope of organic phosphorescence applications.
Journal ArticleDOI
Activating efficient phosphorescence from purely organic materials by crystal design
TL;DR: Novel design principles to create purely organic materials demonstrating phosphorescence that can be turned on by incorporating halogen bonding into their crystals are described and a directed heavy atom design principle is demonstrated that will allow for the development of bright and practical purely organic phosphors.
Journal ArticleDOI
Sunlight-activated long-persistent luminescence in the near-infrared from Cr 3+ -doped zinc gallogermanates
Zhengwei Pan,Yi-Ying Lu,Feng Liu +2 more
TL;DR: A series of Cr(3+)-doped zinc gallogermanate NIR persistent phosphors that exhibit strong emission at 650-1,000 nm, extending beyond the typical 690-750 nm, and with a super-long afterglow of more than 360 h are reported.
Journal ArticleDOI
Long persistent phosphors—from fundamentals to applications
TL;DR: A review of the recent developments in LPPs for the synthesis of nanoparticles from the aspects of particle sizes, monodispersity and homogeneity based on the urgent application of bio-imaging, and an exhibition of new products towards diverse application fields.