Photochromic optical memory based on non-destructive IR read-out

Jeong, Yong-Chul; Kim, Seon-Ho; Ko, Hye-Jin; Song, Ki-Gook; Ahn, Kwang-Hyun; Yang, Sung-Ik

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자료유형: 학술저널

저자정보: Jeong, Yong-Chul (College of Environment and Applied Chemistry and MRCID, Kyung Hee University) Kim, Seon-Ho (College of Environment and Applied Chemistry and MRCID, Kyung Hee University) Ko, Hye-Jin (College of Environment and Applied Chemistry and MRCID, Kyung Hee University) Song, Ki-Gook (College of Environment and Applied Chemistry and MRCID, Kyung Hee University) Ahn, Kwang-Hyun (College of Environment and Applied Chemistry and MRCID, Kyung Hee University) Yang, Sung-Ik (College of Environment and Applied Chemistry and MRCID, Kyung Hee University)

저널정보: 한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제11호

발행연도: 2009.1

수록면: 1,590 - 1,594 (5page)

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The photochromic material 1-(2,5-dimethylthien-1,1-dioxide-3-yl)-2-(2,5-dimethylthien-3-yl)hexafluorocyclopentene (DMTFO2) undergoes reversible photocyclization and ring opening reactions upon alternate irradiation with UV and visible light, respectively. Upon photocyclization, the closed-ring isomer of DMTFO2 showed a strong IR absorption band at 1532 $cm^{-1}$ which was not observed for the open-ring isomer. To understand the IR spectra of DMTFO2, theoretical calculations were carried out using Gaussian 03 program at the B3LYP/6-31G(d) level. We also demonstrated non-destructive readout of photochromic recording by IR spectral difference between the open- and closed-ring isomers of DMTFO2 in film. We found that DMTFO2 exhibited a higher contrast ratio of IR image between open- and closed-ring isomer compared with previously reported 1,2-bis(2,5-dimethylthien-3-yl)-perfluorocyclopentene (DMTF6) because of the increased photoconversion yield as well as higher vibrational transition intensity. These findings along with its high fatigue resistance indicate that DMTFO2 could be an excellent candidate for photon-mode RW(re-writable) memory devices based on photochromic recording and non-destructive IR read-out.

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