Posted in | News | LEDs | Lighting

Researchers Create LEDs with High Efficiency and Low Droop Features

Researchers from Japan and California have developed a new design for blue and green LEDs to reduce efficiency droop. The observations will be demonstrated during the Conference on Lasers and Electro-Optics (CLEO: 2012), scheduled from May 6 to 11 in San Jose, California.

Schematic of the transparent LED packaging design (left). A working blue LED using the design (right). (Photo: Yuji Zhao, University of California Santa Barbara)

The research team designed low droop and high efficacy LEDs by altering the direction of the crystal structure within semiconductor films. Droop refers to significant drop in efficiency at extreme currents. It is one of the major factors that retard the growth of the solid-state lighting market.

Household bulbs generate white light due to the mix of wavelengths with the hue produced from blue and green LEDs. These valuable colors are the ‘droopiest’ of the LEDs and are difficult to design.

LEDs have increased energy-efficiency compared to the heat-generating incandescent bulbs. However, the LEDs lose a major part of this efficiency at high current lighting due to the droop feature. Although the droop-causing factor has not been clearly resolved, the research team at UC Santa Barbara has devised an innovative technique to reduce droop by revolutionizing the production method of LEDs.

LED chips are created from layers of doped semiconductors packed together. By applying voltage through these layers, migration of electrons and holes takes place, which is directed toward an active layer area of LED, resulting in a photon. The commercially available blue LEDs, the c-plane accommodate the crystals that bind the semiconductor layers. Based on this standard orientation of the crystals, electrical fields that intervene during integration of the electrons and holes can be created.

The research team from UCSB designed LEDs that consist of tilted and non-traditional crystal orientations that reduce the field’s effect, showing minimal droop. Based on this approach, compact and low-cost LED chips were developed by the researchers.

Source: http://www.osa.org/

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Choi, Andy. (2019, February 28). Researchers Create LEDs with High Efficiency and Low Droop Features. AZoOptics. Retrieved on April 26, 2024 from https://www.azooptics.com/News.aspx?newsID=15513.

  • MLA

    Choi, Andy. "Researchers Create LEDs with High Efficiency and Low Droop Features". AZoOptics. 26 April 2024. <https://www.azooptics.com/News.aspx?newsID=15513>.

  • Chicago

    Choi, Andy. "Researchers Create LEDs with High Efficiency and Low Droop Features". AZoOptics. https://www.azooptics.com/News.aspx?newsID=15513. (accessed April 26, 2024).

  • Harvard

    Choi, Andy. 2019. Researchers Create LEDs with High Efficiency and Low Droop Features. AZoOptics, viewed 26 April 2024, https://www.azooptics.com/News.aspx?newsID=15513.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type
Submit

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.