Violet-emitting diode may operate at room temperature

Dec. 1, 1995
Fabrication of a violet-emitting diode laser from gallium nitride (GaN) based wide-bandgap materials will be described by researchers from the Nagoya Institute of Technology (Nagoya, Japan) at the 41st annual IEEE International Electron Devices Meeting.

Fabrication of a violet-emitting diode laser from gallium nitride (GaN) based wide-bandgap materials will be described by researchers from the Nagoya Institute of Technology (Nagoya, Japan) at the 41st annual IEEE International Electron Devices Meeting (Dec. 10-13, 1995, Washington, DC). The researchers' paper is the first to report pulsed stimulated emission at 300 K from a current-injected surface-emitting InGaN/AlGaN double-heterostructure diode whose active layer comprises InGaN co-doped with silicon and zinc.

At injection currents above 400 mA, the main emission wavelength is 380 nm, which originates from band-to-band emission in the InGaN layer. A weaker emission at 440 nm is attributed by the researchers to impurity in the same layer and saturates as the injected current increases above 800 mA.

Although stimulated emission from photopumped GaN devices has been reported at temperatures up to 425 K, only spontaneous emission has previously been observed at 300 K with current injection. The researchers hope their technique can be developed for diode-laser operation at room temperature.

About the Author

Stephen G. Anderson | Director, Industry Development - SPIE

 Stephen Anderson is a photonics industry expert with an international background and has been actively involved with lasers and photonics for more than 30 years. As Director, Industry Development at SPIE – The international society for optics and photonics – he is responsible for tracking the photonics industry markets and technology to help define long-term strategy, while also facilitating development of SPIE’s industry activities. Before joining SPIE, Anderson was Associate Publisher and Editor in Chief of Laser Focus World and chaired the Lasers & Photonics Marketplace Seminar. Anderson also co-founded the BioOptics World brand. Anderson holds a chemistry degree from the University of York and an Executive MBA from Golden Gate University.    

Sponsored Recommendations

Melles Griot® XPLAN™ CCG Lens Series

March 19, 2024
IDEX Health & Science sets a new standard with our Melles Griot® XPLAN™ CCG Lens Series fluorescence microscope imaging systems. Access superior-quality optics with off-the-shelf...

Spatial Biology

March 19, 2024
Spatial Biology refers to the field that integrates spatial information into biological research, allowing for the study of biological systems in their native spatial context....

Fluorescent Protein Optical Imaging Considerations

March 19, 2024
What factors should you consider when your incorporate fluorescent proteins in an optical imaging application? Learn more.

Custom-Engineered Optical Solutions for Your Application

March 19, 2024
We combine advanced optical design and manufacturing technology, with decades of experience in critical applications, to take you from first designs to ongoing marketplace success...

Voice your opinion!

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