ZnO nanowire LED has ultralow driven current

Dec. 1, 2010
Zinc oxide (ZnO) is an interesting optical semiconductor that is potentially useful for short-wavelength LEDs (as well as photodetectors).

Zinc oxide (ZnO) is an interesting optical semiconductor that is potentially useful for short-wavelength LEDs (as well as photodetectors). It is unusual in that its normal use is not as a single-crystalline layer, but instead as nanostructures such as nanowires and nanoflakes, used either singly or in sheets. Researchers at the Chinese Academy of Sciences (Changchun and Beijing, China), Jilin University (Changchun, China), and Northeast Normal University (Changchun, China) are creating deep-blue-emitting LEDs that, in some versions, have a polymer intrinsic layer; the devices exhibit a low driven current with a microampere amplitude.

Two types of LED were created: One had a magnesium oxide (MgO) intrinsic layer and a ZnO layer containing vertically aligned ZnO nanowires, while the other had polymer as the intrinsic layer and a ZnO layer with randomly oriented nanowires (both had nanowires with 300 nm diameters). The polymer-containing version had better carrier-blocking ability, resulting in less emission outside the intended 400 nm region. In addition, the 330 μA forward injection current for the polymer version was far lower than the 5.04 mA forward injection current for the MgO-containing version.

Contact Dongxu Zhao at[email protected].

More Laser Focus World Current Issue Articles


More Laser Focus World Archives Issue Articles

Sponsored Recommendations

Request a quote: Micro 3D Printed Part or microArch micro-precision 3D printers

April 11, 2024
See the results for yourself! We'll print a benchmark part so that you can assess our quality. Just send us your file and we'll get to work.

Request a free Micro 3D Printed sample part

April 11, 2024
The best way to understand the part quality we can achieve is by seeing it first-hand. Request a free 3D printed high-precision sample part.

How to Tune Servo Systems: The Basics

April 10, 2024
Learn how to tune a servo system using frequency-based tools to meet system specifications by watching our webinar!

Precision Motion Control for Sample Manipulation in Ultra-High Resolution Tomography

April 10, 2024
Learn the critical items that designers and engineers must consider when attempting to achieve reliable ultra-high resolution tomography results here!

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!