| CPC C09K 11/642 (2013.01) [C09K 11/605 (2013.01); C09K 11/881 (2013.01); B82Y 20/00 (2013.01); B82Y 40/00 (2013.01)] | 16 Claims |

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1. A plurality of nanocrystals having the formula:
Cu—Al—X2, where X is S or Se,
wherein the nanocrystals have a luminescence quantum yield of at least 10%.
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