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Kim M, Kim J, Kim H, Jung I, Kwak H, Lee GS, Na YJ, Hong YK, Park DH, Lee KT. Direct Visualization of UV-Light on Polymer Composite Films Consisting of Light Emitting Organic Micro Rods and Polydimethylsiloxane. Polymers (Basel) 2022; 14:polym14091846. [PMID: 35567014 PMCID: PMC9103940 DOI: 10.3390/polym14091846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 04/24/2022] [Accepted: 04/27/2022] [Indexed: 12/10/2022] Open
Abstract
We experimentally demonstrate the direct visualization of ultraviolet (UV) light using flexible polymer composite films consisting of crystalline organic tris-(8-hydroxyquinoline) aluminum (Alq3) micro-rods and polydimethylsiloxane (PDMS). The representative organic mono-molecule Alq3, which is a core material of organic light-emitting diodes, was used to detect light in the invisible UV region and visualize photoluminescence (PL). Alq3 shows absorption in the UV region and light-emitting characteristics in the green region, making it an optimal material for UV visualization because of its large Stokes transition. Crystalline Alq3 micro-rods were fabricated in a deionized water solution through a sequential process of reprecipitation and self-assembly. Highly bright photoluminescence was observed on the highly crystalline Alq3 micro-rods under UV light excitation, indicating that the crystalline structures of Alq3 molecules affect the visible emission decay of excitons. The Alq3 micro-rods were manufactured as flexible polymer composite films using a PDMS solution to observe UV photodetector characteristics according to UV intensity, and it was confirmed that the intensity of the fine UV light reaching the earth’s surface can be visualized by making use of this UV photodetector.
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Affiliation(s)
- Misuk Kim
- Department of Physics, Inha University, Incheon 22212, Korea; (M.K.); (H.K.); (I.J.); (H.K.)
| | - Jiyoun Kim
- Department of Chemical Engineering, Program in Biomedical Science and Engineering, Inha University, Incheon 22212, Korea;
| | - Hyeonwoo Kim
- Department of Physics, Inha University, Incheon 22212, Korea; (M.K.); (H.K.); (I.J.); (H.K.)
| | - Incheol Jung
- Department of Physics, Inha University, Incheon 22212, Korea; (M.K.); (H.K.); (I.J.); (H.K.)
| | - Hojae Kwak
- Department of Physics, Inha University, Incheon 22212, Korea; (M.K.); (H.K.); (I.J.); (H.K.)
| | - Gil Sun Lee
- Department of General Education, Kookmin University, Seoul 02707, Korea;
| | - Young Jun Na
- Department of Physics, Gyeongsang National University, Jinju 52828, Korea;
| | - Young Ki Hong
- Department of Physics, Gyeongsang National University, Jinju 52828, Korea;
- Research Institute of Natural Science, Gyeongsang National University, Jinju 52828, Korea
- Correspondence: (Y.K.H.); (D.H.P.); (K.-T.L.); Tel.: +82-55-772-1407 (Y.K.H.); +82-32-860-7496 (D.H.P.); +82-32-860-7653 (K.-T.L.)
| | - Dong Hyuk Park
- Department of Chemical Engineering, Program in Biomedical Science and Engineering, Inha University, Incheon 22212, Korea;
- Correspondence: (Y.K.H.); (D.H.P.); (K.-T.L.); Tel.: +82-55-772-1407 (Y.K.H.); +82-32-860-7496 (D.H.P.); +82-32-860-7653 (K.-T.L.)
| | - Kyu-Tae Lee
- Department of Physics, Inha University, Incheon 22212, Korea; (M.K.); (H.K.); (I.J.); (H.K.)
- Correspondence: (Y.K.H.); (D.H.P.); (K.-T.L.); Tel.: +82-55-772-1407 (Y.K.H.); +82-32-860-7496 (D.H.P.); +82-32-860-7653 (K.-T.L.)
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