Researchers from Belgium, France, and Canada have improved light-emitting diodes (LEDs) based on the structure of the witch firefly tail illuminator, which can increase efficiency by more than 50%.
When the researchers studied the illuminator at the tail of the firefly, they accidentally discovered a jagged arrangement of scales that increased the brightness of the illuminator. The scientists then applied it to the LED design to create an LED overlay that mimics the natural structure of the firefly illuminator. This overlay can increase LED light extraction efficiency by up to 55% and is easy to apply to existing diode designs, saving more energy.
With the help of scanning electron microscopy, the researchers discovered nanoscale skeletons on the firefly's stratum corneum, as well as larger scales. When researchers used computers to simulate the process by which this structure affected light propagation, it was found that most of the light was emitted from the sharp edges of these jagged scales. The researchers then confirmed this result experimentally, and they had the highest brightness when they irradiated the stratum corneum from below.
Researchers have published an article describing ways to add a serrated overlay to a standard GaN LED. Nicolas André of the University of Sherbrooke in Canada painted a layer of photosensitive material on a standard gallium nitride LED and then used a laser-irradiated cross-section to create a triangular bevel resembling a factory roof. Because light travels faster in LEDs than in the firefly's stratum corneum, scientists have adjusted the size of these "scales" to maximize light extraction efficiency.
When the researchers studied the illuminator at the tail of the firefly, they accidentally discovered a jagged arrangement of scales that increased the brightness of the illuminator. The scientists then applied it to the LED design to create an LED overlay that mimics the natural structure of the firefly illuminator. This overlay can increase LED light extraction efficiency by up to 55% and is easy to apply to existing diode designs, saving more energy.
With the help of scanning electron microscopy, the researchers discovered nanoscale skeletons on the firefly's stratum corneum, as well as larger scales. When researchers used computers to simulate the process by which this structure affected light propagation, it was found that most of the light was emitted from the sharp edges of these jagged scales. The researchers then confirmed this result experimentally, and they had the highest brightness when they irradiated the stratum corneum from below.
Researchers have published an article describing ways to add a serrated overlay to a standard GaN LED. Nicolas André of the University of Sherbrooke in Canada painted a layer of photosensitive material on a standard gallium nitride LED and then used a laser-irradiated cross-section to create a triangular bevel resembling a factory roof. Because light travels faster in LEDs than in the firefly's stratum corneum, scientists have adjusted the size of these "scales" to maximize light extraction efficiency.
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