Application of Photochromic 5-Dimethylaminoindolylfulgide to Photon-Mode Erasable Optical Memory Media with Non-Destructive Readout Ability Based on Wavelength Dependence of Bleaching Quantum Yield

1994 ◽  
Vol 23 (10) ◽  
pp. 1869-1872 ◽  
Author(s):  
Fumio Matsui ◽  
Hitoshi Taniguchi ◽  
Yasushi Yokoyama ◽  
Kazuhiro Sugiyama ◽  
Yukio Kurita
Keyword(s):  
Quantum Yield ◽  
Optical Memory ◽  
Wavelength Dependence ◽  
Photon Mode ◽  
Non Destructive

Photochromism of 2-Hydroxy-4′-methoxychalcone: A Novel Photon-Mode Erasable Optical Memory System with Nondestructive Readout Ability

2000 ◽  
Vol 29 (2) ◽  
pp. 96-97 ◽  
Author(s):  
Hiroaki Horiuchi ◽  
Hitoshi Shirase ◽  
Tetsuo Okutsu ◽  
Ryoka Matsushima ◽  
Hiroshi Hiratsuka
Keyword(s):  
Optical Memory ◽  
Memory System ◽  
Photon Mode

The Dependence of Quantum Yield on Wavelength and Growth Irradiance

1987 ◽  
Vol 14 (1) ◽  
pp. 69 ◽  
Author(s):  
JR Evans
Keyword(s):  
Quantum Yield ◽  
Oxygen Evolution ◽  
Narrow Band ◽  
Red Light ◽  
Leaf Disc ◽  
Wavelength Dependence ◽  
Oxygen Electrode ◽  
Quantum Yields ◽  
Growth Irradiance ◽  
Spinach Leaves

The wavelength dependence of photosynthetic quantum yield was measured in a leaf disc oxygen electrode using narrow-band interference filters. Photorespiration was suppressed by measuring oxygen evolution in air containing ~ 1% CO2. Rates of oxygen evolution were determined as a function of absorbed irradiances between 0 and 100 �mol quanta m-2 s-1 and the slope was taken as the quantum yield. The wavelength-dependence previously observed in many species was confirmed for pea and spinach leaves. The maximum quantum yields obtained here and by others are close to 0.111 mol O2 mol-1 quanta for red light. Given the wavelength dependence of quantum yield and the spectral distribution of light, the quantum yields for various white lights were calculated to be around 85% of the red maximum. The quantum yields in white light were the same for plants grown at different irradiances. It is argued that the wavelength dependence of quantum yield reflects the distribution of quanta between the two photosystems with the quantum yield dropping at wavelengths strongly absorbed by chlorophyll b as this is mainly associated with photosystem II.

scholarly journals Photo-Switchable Aggregation-Induced Emission of Bisthienylethene-Dipyrimido[2,1-b][1,3]benzothiazole Triad

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5382
Author(s):  
Shan-Shan Gong ◽  
Chun-Hong Zheng ◽  
Zhen-Zhen Chen ◽  
Dong-Zhao Yang ◽  
Mei Chi ◽  
...  
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Potential Application ◽  
Optical Memory ◽  
Light Irradiation ◽  
Pmma Film ◽  
High Contrast ◽  
Photochromic Properties ◽  
Non Destructive

A bisthienylethene-dipyrimido[2,1-b][1,3]benzothiazole (BTE-2PBT) triad has been designed and synthesized based on our recent discovery of PBTs as atypical propeller-shaped novel AIEgens. The triad not only maintains the photochromic properties of BTE moiety in solution, film, and solid state but also exhibits remarkable AIE properties. Moreover, the fluorescence of BTE-2PBT PMMA film could be modulated with high contrast by alternate UV and visible light irradiation. Photoerasing, rewriting, and non-destructive readout of fluorescent images on BTE-2PBT PMMA film well demonstrate its potential application as optical memory media.

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