AsianScientist (Jun. 22, 2015) – Researchers at Hiroshima University have developed a simple technique for manufacturing white-blue light-emitting diodes (LEDs) using silicon quantum dots (Si QD). Their research, published in Applied Physics Letters, could be used in next-generation flexible lighting and displays.
The team, led by Professor Ken-ichi Saitow and first author graduate student Ms. Xin Yunzi, used simple and inexpensive methods to produce the hybrid LEDs; almost all processes were solution-based and conducted at ambient temperature and pressure.
Conductive polymer solutions and a colloidal Si QD solution were deposited on the glass substrate to obtain an LED that had current and optical power densities that were respectively 280 and 350 times greater than those reported previously 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.
“QD LED has attracted significant attention as a next-generation LED. Although several breakthroughs will be required for achieving implementation, a QD-based hybrid LED allows us to give so fruitful feature that we cannot imagine,” said Saitow.
The article can be found at: Xin et al. (2015) White-Blue Electroluminescence From A Si Quantum Dot Hybrid Light-Emitting Diode .
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Source: Hiroshima University.
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