Red, Green, Yellow, Blue …

Reading time ( words)

The color of the light emitted by an LED can be tuned by altering the size of their semiconductor crystals. LMU researchers have now found a clever and economical way of doing just that, which lends itself to industrial-scale production.

Unlike our old friend the incandescent lightbulb, light-emitting diodes (or LEDs) produce light of a defined color within the spectral range from the infrared to the ultraviolet. The exact wavelength of the emission is determined by the chemical composition of the semiconductor employed, which is the crucial component of these devices. In the case of some semi-conducting materials, the color can also be tuned by appropriately modifying the size of the crystals of which the light-emitting layer is composed. In crystals with dimensions on the order of a few nanometers, quantum mechanical effects begin to make themselves felt.

LMU researchers in collaboration with colleagues at the University of Linz (Austria) have now developed a method for the production of semi-conducting nanocrystals of defined size based on the cheap mineral oxide known as perovskite. These crystals are extremely stable, which ensures that the LEDs exhibit high color fidelity – an important criterion of quality. Moreover, the resulting semiconductors can be printed on suitable surfaces, and are thus predestined for the manufacture of LEDs for use in displays.

The crucial element in the new method is a thin wafer, only a few nanometers thick, which is patterned like a waffle. The depressions serve as tiny reaction vessels, whose shape and volume ultimately determine the final size of the nanocrystals. “Optimal measurements of the size of the crystals were obtained using a fine beam of high-energy X-radiation at the Deutsche Elektronen-Synchrotron (DESY) in Hamburg“, says LMU researcher Dr. Bert Nickel, member of the Nanosystems Initiative Munich (NIM), a Cluster of Excellence.

Moreover, the wafers are produced by means of an economical electrochemical process, and can be fashioned directly into LEDs. “Our nanostructure oxide layers also prevent contact between the semiconductor crystals and deleterious environmental factors such as free oxygen and water, which would otherwise limit the working lifetime of the LEDs,” as Dr. Martin Kaltenbrunner of the Johannes Kepler University in Linz explains. In the next step, we want to enhance the efficiency of these diodes further, and explore their potential for use in other applications, such as flexible displays.


Suggested Items

CONFERS to Establish “Rules of the Road” for On-Orbit Servicing of Satellites

10/06/2017 | DARPA
“Rules of the road”—widely accepted norms of safety-related behavior based on common understanding—have existed in various forms over the centuries, and have evolved as new technologies have revolutionized how people and vehicles travel. But how are these “rules” created when common understanding of new capabilities is not yet established?

A Camera That Can See Unlike Any Imager Before It

09/20/2016 | DARPA
Picture a sensor pixel about the size of a red blood cell. Now envision a million of these pixels—a megapixel’s worth—in an array that covers a thumbnail.

Stretchable Inks: Changing the Wearables Market and the Landscape of Manufacturing

05/13/2015 | Barry Matties, I-Connect007
I-Connect007 Publisher Barry Matties and DuPont’s Steven Willoughby and Michael Burrows spoke recently and discussed new material for wearable electronics: stretchable inks. Wearable electronics is a fast growing sector of the electronics industry that is inspiring new and exciting products, as well as changing the requirements for becoming an electronics manufacturer.

Copyright © 2017 I-Connect007. All rights reserved.