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A novel host-guest luminous system with enhanced near-UV light absorption thereby enhanced luminescence are designed based on the synergism of quantum confinement, spatial confinement, and antenna effect, where ultrasmall Y2O3:Eu3+ nanocrystals are fixed inside MOF (Eu/Y-BTC) as supporting structure. The Eu/Y-BTC not only limits the size and leads to lattice distortion of Y2O3:Eu3+ nanocrystals and controls the distance between nanocrystals, but also promotes the light absorption and emission. The significantly red-shifted and broadened charge transfer band of Y2O3:Eu3+/(Eu/Y-BTC) leads to the excellent applications of Y2O3:Eu3+ in white light-emitting diodes (LEDs). Our results show that white light with superior color quality (CRI>90) and extremely high luminous efficacy (an LER of 335 lm/W) could be achieved using Y2O3:Eu3+/(Eu/Y-BTC) as red phosphor. The Y2O3:Eu3+/ (Eu/Y-BTC) also improves the photoelectric performance of dye-sensitized solar cells (DSSCs), not only because Y2O3:Eu3+/(Eu/Y-BTC) has a large specific surface area and the adsorption amount of the dye is increased, but also because the valence band position of Y2O3:Eu3+/(Eu/Y-BTC) is 2.41 eV, which can provide an additional energy level between the TiO2 and dye, promoting electron transfer. For these advantageous features, the multifunctional Y2O3:Eu3+/(Eu/Y-BTC) composite product will open new avenues in white LEDs and DSSCs.
This work was supported by the National Natural Science Foundation of China (No. 21871079) and the National Science Foundation (No. 1945558).