Fig. 8From: Enhance the Er3+ Upconversion Luminescence by Constructing NaGdF4:Er3+@NaGdF4:Er3+ Active-Core/Active-Shell NanocrystalsProposed energy transfer mechanism in NaGdF4:12%Er3+@NaGdF4:10%Er3+ active-core/active-shell NPs under 1540-nm excitationBack to article page