High wall-plug efficiency blue III-nitride LEDs designed for low current density operation

Commercial LEDs for solid-state lighting are often designed for operation at current densities in the droop regime (~35 A/cm ) to minimize costly chip area; however, many benefits can be realized by operating at low current density (J ≈1 - 5 A/cm ). Along with mitigation of droop losses and reductio...

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Bibliographic Details
Published in:Optics express 2017-11, Vol.25 (24), p.30696-30707
Main Authors: Kuritzky, Leah Y, Espenlaub, Andrew C, Yonkee, Benjamin P, Pynn, Christopher D, DenBaars, Steven P, Nakamura, Shuji, Weisbuch, Claude, Speck, James S
Format: Article
Language:English
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Summary:Commercial LEDs for solid-state lighting are often designed for operation at current densities in the droop regime (~35 A/cm ) to minimize costly chip area; however, many benefits can be realized by operating at low current density (J ≈1 - 5 A/cm ). Along with mitigation of droop losses and reduction of the operating voltage, low J operation of LEDs opens the design space for high light extraction efficiency (LEE). This work presents detailed ray tracing simulations of an LED design for low J operation with LEE ≈94%. The design is realized experimentally resulting in a peak wall-plug efficiency of 78.1% occurring at 3.45 A/cm and producing an output power of 7.2 mW for a 0.1 mm emitting area. At this operation point, the photon voltage V =hνq exceeds the forward voltage (V), corresponding to a Vp/V = 103%.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.25.030696