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![Using an epitaxial approach, researchers developed a 3-D photonic crystal LED, the first such optoelectronic device. [Graphic by Eric Nelson]](https://www.led-professional.com/media/technology_light-generation_new-3-d-photonic-crystal-has-both-electronic-and-optical-properties_3-d-photonic-crystal-led-jpg/@@images/image.jpeg "Using an epitaxial approach, researchers developed a 3-D photonic crystal LED, the first such optoelectronic device. [Graphic by Eric Nelson]")
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