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Eu:GaN powder synthesized using a high temperature ammonothermal process is known to be dark in appearance due to presence of Eu-containing absorbing particles. Improvement of the visual quality of the Eu:GaN powder is achieved by rinsing in dilute acids. Acid-rinsed Eu:GaN has photoluminescence (PL) enhanced by a factor of 3 when compared to as-prepared Eu:GaN. Such visually clear powders are used...
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