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Originally Posted by Quoth
You can't buy them, and they can't be decent colour rendition without a layer on top of the LED.
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So, no there are currently no actual LEDs that are natively white, and if what ever that is ever leaves the lab to production it will turn out to be not actually an LED.
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I'm afraid that's simply not the case. Monolithic LEDs with multiple quantum wells can produce polychromatic light, including white, to perfectly acceptable CRIs.
Here are some papers and articles on the subject - interesting reading.
Polarized monolithic white semipolar (20–21) InGaN light-emitting diodes grown on high quality (20–21) GaN/sapphire templates and its application to visible light communication
Design, growth, fabrication and characterization of white LEDs by monolithic on-chip epitaxial integration on (11-22) semi-polar GaN
Optics and Photonics News: A Phosphor-Free White LED
Design analysis of phosphor-free monolithic white light-emitting-diodes with InGaN/ InGaN multiple quantum wells on ternary InGaN substrates