拉斯维加斯赌城

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Egg-OLED

Experimental Physics IV

  1. University
  2. Faculties
  3. Faculty of Mathematics, Natural Sciences, and Materials Engineering
  4. Institute of Physics
  5. Chairs, professors and groups
  6. Experimental Physics IV
  7. Workgroups
  8. Organic Semiconductors
  9. Egg-OLED

Egg-OLED

A true easter-Egg

At Easter, the Organic Semiconductors research group at the Chair of Experimental Physics IV at the University of Augsburg presents a very special egg: a glowing LED Easter egg. This small work of art (only about 1.5 × 1 cm in size on a 2 × 2 cm glass substrate) is much more than a creative gimmick. It combines key materials and research approaches of the group in a vivid, tangible object. At its core are so-called organic semiconductors. These are carbon-based molecules that have electrical conductivity between that of conductors and insulators. They can conduct electricity—and above all: produce light. Such materials form the basis of modern displays, for example in smartphones, tablets, or televisions. The technology behind them is known as organic light-emitting diodes, or OLEDs for short.
? University of Augsburg

Different Materials

Have you ever wondered how the screens of your smartphone or TV produce such vivid colors??In OLED displays, light is generated by specially designed organic molecules whose electrical and photophysical properties can be tailored through subtle changes in their chemical structure. This has led to a remarkable evolution of emitter technologies, ranging from fluorescent and phosphorescent systems to thermally activated delayed fluorescence (TADF), exciplex emission, and color conversion using quantum dots.

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Inspired by the colored Easter eggs of the season, the device shown above visualizes that diversity in a simple and colorful way. It combines blue fluorescence, red phosphorescence and green TADF emission, as well as green color conversion by CsPbBr? quantum dots deposited on a blue-emitting region. By integrating these concepts into a single stack, the device highlights how multiple emission pathways can coexist within one OLED architecture. The device stack needed to be simple, so we searched (and found) for common hole and electron transport materials, that could be combined with all required emitter molecules. A more scientific overview on the structure is given below. Happy easter!

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Sketch of the stack of the easter OLED with materials and contacs. The two portions of the egg use different "base" color, with addition of the red phosphorescent "cents". The green shaddow on the top are pervoskite nano crystals. ? University of Augsburg

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