Frequency dependence of quantum efficiency for hole formation in photochemical hole-burning for dye-doped polymer systems
✍ Scribed by Kazuyuki Horie; Makoto Ikemoto; Taro Suzuki; Shinjiro Machida; Takashi Yamashita; Norio Murase
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 452 KB
- Volume
- 195
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Marked frequency dependence of the quantum efficiency for hole formation was observed at 4 and 20 K for photochemical hole-burning of free-base tetraphenylporphin (TPP) and sulfonated TPP in poly(viny1 alcohol) (PVA) and other polymers as well as non-photochemical hole-burning of methylene blue in PVA. The quantum efficiency of hole formation at the lower-frequency foot of the lowest-energy absorption band is about 10 times larger than that at the higher-frequency foot, which could be due to the existence of several vibronic states in the lowest-energy absorption band with different molar extinction coefftcients, hole formation efficiencies, and/or Debye-Wailer factors.