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

Select Volume / Issue:

• Volume 3,Issue 3,May 2015

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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