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Photoresponsive Luminescence Switching of Metal‐Free Organic Phosphors Doped Polymer Matrices

https://doi.org/10.1002/adom.202000654

Zang, Lixin ; Shao, Wenhao ; Kwon, Min Sang ; Zhang, Zhiguo ; Kim, Jinsang ( October 2020 , Advanced Optical Materials)

Abstract
A new type of luminescence switching behavior based on phosphorescence enhancement from a series of metal‐free organic phosphors doped polymers by UV‐irradiation is investigated. This phenomenon is observed only from pairs of organic phosphors and polymer matrices having a combination of appropriate triplet exciton lifetime and oxygen permeability. Systematic investigation reveals that the luminescence switching behavior of organic phosphors embedded in a specific polymeric matrix stems from the conversion of triplet oxygens to singlet oxygens by UV‐irradiation, leading to the unique phosphorescence enhancement of organic phosphors. Visualization of latent information by UV‐irradiation is demonstrated toward novel secure information communication applications.

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Room‐Temperature‐Phosphorescence‐Based Dissolved Oxygen Detection by Core‐Shell Polymer Nanoparticles Containing Metal‐Free Organic Phosphors

https://doi.org/10.1002/anie.201708606

Yu, Youngchang ; Kwon, Min Sang ; Jung, Jaehun ; Zeng, Yingying ; Kim, Mounggon ; Chung, Kyeongwoon ; Gierschner, Johannes ; Youk, Ji Ho ; Borisov, Sergey M. ; Kim, Jinsang ( November 2017 , Angewandte Chemie International Edition)
Room‐Temperature‐Phosphorescence‐Based Dissolved Oxygen Detection by Core‐Shell Polymer Nanoparticles Containing Metal‐Free Organic Phosphors

https://doi.org/10.1002/ange.201708606

Yu, Youngchang ; Kwon, Min Sang ; Jung, Jaehun ; Zeng, Yingying ; Kim, Mounggon ; Chung, Kyeongwoon ; Gierschner, Johannes ; Youk, Ji Ho ; Borisov, Sergey M. ; Kim, Jinsang ( November 2017 , Angewandte Chemie)

Abstract
The highly sensitive optical detection of oxygen including dissolved oxygen (DO) is of great interest in various applications. We devised a novel room‐temperature‐phosphorescence (RTP)‐based oxygen detection platform by constructing core–shell nanoparticles with water‐soluble polymethyloxazoline shells and oxygen‐permeable polystyrene cores crosslinked with metal‐free purely organic phosphors. The resulting nanoparticles show a very high sensitivity for DO with a limit of detection (LOD) of 60 nmand can be readily used for oxygen quantification in aqueous environments as well as the gaseous phase.

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