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Proceedings Paper

Measurement of photoluminescence from a twisted-nematic liquid crystal/dye cell for an application in an energy-harvesting display
Author(s): Masamichi Ohta; Shunsuke Itaya; Shintaro Ozawa; Nada Dianah Binti M. Azmi; Ichiro Fujieda
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Paper Abstract

One can convert a Luminescent Solar Concentrator (LSC) to an energy-harvesting display by scanning a laser beam on it. By incorporating a guest-host system of liquid crystal (LC) and dye materials in an LSC, the power of photoluminescence (PL) utilized for either display or energy-harvesting can be adjusted to the changes in ambient lighting conditions. We have measured basic characteristics of an LC/dye cell with twisted-nematic (TN) alignment. These are absorption of the laser light, PL radiation pattern, contrast of luminance, spreading of the PL generated by a narrow laser beam, and their dependencies on the bias. The results are similar to those of the LC/dye cell with antiparallel (AP) alignment with the following exceptions. First, absorption by the TN cell depends on the bias for both polarization components of the excitation light, while the AP cell exhibits a bias dependency only for the component polarized along the alignment direction. Second, the PL from the TN cell is mostly polarized along the alignment direction on the exit side of the cell while the PL from the AP cell is mostly polarized along its alignment direction. These observations can be attributed to the fact that the polarization plane of a linearly polarized light rotates as it propagated the TN-LC layer. For both AP and TN cells, low-intensity PL is observed from the whole cell surfaces. This can degrade the contrast of a displayed image. Bias application to the cell suppresses this effect.

Paper Details

Date Published: 23 September 2016
PDF: 8 pages
Proc. SPIE 9937, Next Generation Technologies for Solar Energy Conversion VII, 99370R (23 September 2016); doi: 10.1117/12.2237454
Show Author Affiliations
Masamichi Ohta, Ritsumeikan Univ. (Japan)
Shunsuke Itaya, Ritsumeikan Univ. (Japan)
Shintaro Ozawa, Ritsumeikan Univ. (Japan)
Nada Dianah Binti M. Azmi, Ritsumeikan Univ. (Japan)
Ichiro Fujieda, Ritsumeikan Univ. (Japan)

Published in SPIE Proceedings Vol. 9937:
Next Generation Technologies for Solar Energy Conversion VII
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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