First electron quantum tight confinement, causing their energy levels to become discrete rather than continuous, without physical downsizing

https://www.eurekalert.org/news-releases/1092026

"reducing effective (not physical) conjugation length—the distance across which π-electrons move freely through single/ double bond system—to form graphene, carbon, or polymer quantum dots with improved semiconductor photoluminescence/ electronic properties... without shrinking material itself, modulate exciton's radius which remains localized within material's building blocks/ recombining radiatively, resulting in strong 73% PL quantum yield... COFs in lighting/ optoelectronic equipment, chemical sensors"