Improved Light Emission Properties and Operation Lifetime of Multi-Layered Organic Light-Emitting Diodes using Dyes Extracted from Spinach

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Year:
2015
Type of Publication:
Article
Keywords:
Organic Light-Emitting Diode, Chlorophyll, Carotenoid, Antioxidant Effect
Authors:
Yusuke Nishida; Naoki Ohtani
Journal:
IJISM
Volume:
3
Number:
3
Pages:
168-170
Month:
May
Abstract:
Multi-layered organic light-emitting diodes (OLEDs) containing chlorophyll as an emissive material were fabricated to improve their light emission efficiencies. The chlorophyll was extracted from spinach. In quintuple-layer OLEDs, the hole-blocking layer plays an important role to increase the emission intensity. In addition, we evaluated the antioxidant activities of the carotenoids that were also extracted from spinach. They were doped in the electron-transporting layer in one sample, and in the hole-blocking layer in another sample to change the distance from the carotenoids to the active layer. As a result, the OLED containing the carotenoid-doped hole-blocking layer revealed longer operation lifetime, because the hole-blocking layer was adjacent to the active layer, leading to more effective antioxidant activities.

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