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Photon upconversion with directed emission.

K Börjesson1,2, P Rudquist3, V Gray2

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|August 31, 2016
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Summary
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Researchers controlled the direction of photon upconversion emission using a liquid crystalline matrix. This breakthrough enhances solar cell efficiency by managing light directionally, offering a new pathway for advanced photovoltaic technologies.

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Optoelectronics

Background:

  • Photon upconversion (UC) can overcome the Shockley-Queisser limit for single-junction solar cells.
  • Efficient light management is crucial for maximizing UC efficiency in solar energy applications.
  • Controlling the directionality of UC emission is a key challenge.

Purpose of the Study:

  • To demonstrate reversible control over the direction of photon upconversion emission.
  • To integrate this control mechanism into a triplet-triplet annihilation photon upconversion (TTA-UC) system.
  • To assess the performance and stability of the developed system for solar energy applications.

Main Methods:

  • Embedding anthracene derivatives and palladium porphyrin in a liquid crystalline matrix.
  • Utilizing a triplet-triplet annihilation photon upconversion (TTA-UC) scheme.
  • Employing the liquid crystalline matrix to control the orientation of UC emitters.

Main Results:

  • Achieved controlled switching of directional anti-Stokes emission.
  • Obtained an emission ratio of 0.37 (axial vs. longitudinal) and directivity of 1.52.
  • Demonstrated multi-cycle switching capability without degradation, limited only by liquid crystal alignment speed.

Conclusions:

  • Reversible control of UC emission direction is feasible using liquid crystalline matrices.
  • This method offers a promising approach for efficient light management in solar cells.
  • The system shows potential for practical applications in advanced photovoltaic devices.