A Si quantum dot (QD)-based hybrid¹ inorganic/organic light-emitting diode (LED) that exhibits white-blue electroluminescence has been fabricated by Professor Ken-ichi SAITOW (Natural Science Center for Basic Research and Development, Hiroshima University), Graduate student Yunzi XIN (Graduate School of Science, Hiroshima University), and their collaborators. A hybrid LED is expected to be a next-generation illumination device for producing flexible lighting² and display, and this is achieved for the Si QD-based white-blue LED. For details, refer to "White-blue electroluminescence from a Si quantum dot hybrid light-emitting diode," in Applied³ Physics Letters; DOI: 10.1063/1.4921415. The Si QD hybrid LED was developed using a simple method; almost all processes were solution-based and conducted at ambient temperature and pressure. Conductive polymer solutions and a colloidal⁴ Si QD solution were deposited on the glass substrate. The current and optical power densities⁵ of the LED are, respectively, 280 and 350 times greater than those reported previously⁶ for such a device at the same voltage (6 V). In addition, the active area of the LED is 4 mm2, which is 40 times larger than that of a typical commercial LED; the thickness of the LED is 0.5 mm.

 

Professor Saitow stated, "QD LED has attracted significant attention as a next-generation LED. Although several breakthroughs will be required for achieving implementation⁷, a QD-based hybrid LED allows us to give so fruitful feature that we cannot imagine."

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