5. 5 . Thin single crystals of anthracene, sandwiched between two electrodes were used to generate light in the earliest

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5 5 Thin Single Crystals Of Anthracene Sandwiched Between Two Electrodes Were Used To Generate Light In The Earliest 1 (129.01 KiB) Viewed 9 times

5. 5 . Thin single crystals of anthracene, sandwiched between two electrodes were used to generate light in the earliest OLED prototypes, which were developed in the 1960s. Since then many improvements have been made to the design of OLED devices, including the addition of several additional layers. (a) Using the anthracene example to illustrate your answers, describe the following processes that occur in OLEDs: (i) Electron and hole generation [2 marks] (ii) Charge transport [2 marks] (iii) Recombination/electron transfer [2 marks] (iv) Emission [2 marks] (b) Draw a schematic of a more modern three-layer OLED and explain how the modifications from the anthracene example increase efficiency. marks]