So far, most techniques for modifying perovskite solar cells (PSCs) focus on either the perovskite or electron transport layer (ETL). For the sake of comprehensively improving device performance, a dual‐functional method of simultaneously passivating trap defects in both the perovskite and ETL films is proposed that utilizes guidable transfer of Eu3+ in SnO2 to perovskite. Europium ions are distributed throughout the SnO2 film during the formation process of SnO2, and they can diffuse directionally through the SnO2/perovskite interface into the perovskite, while most of the europium ions remain at the interface. Under the synergistic effect of distributed Eu3+ in the SnO2 and aggregated Eu3+ at the interface, the electron mobilities of ETLs are evidently improved. Meanwhile, diffused Eu3+ ions passivate the perovskite to reduce trap densities at the grain boundaries, which can dramatically elevate the open‐circuit voltage (Voc) of PSCs. Finally, the mainly PSCs coated on SnO2:Eu3+ ETL achieve a power conversion efficiency of 20.14%. Moreover, an unsealed device degrades by only 13% after exposure to ambient atmosphere for 84 days.

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Light-emitting glass shows potential to be used in high-power light-emitting diode (LED) devices because of its homogeneous emission, excellent thermal stability, and simple and low-cost fabrication procedures. The reported quantum efficiencies (QEs) of Ce3+-based luminescent glasses do not compete with those of phosphors because of their loose structures. In this study, a series of high-efficiency luminescent strontium borate (SBO) glasses SBO:Ce3+, Tb3+ are designed and developed. Our work skillfully takes advantage of the Tb3+ ion acquiring the transferred energy from nonluminescent Ce4+ and luminescent center Ce3+ ions, almost doubling their luminescence QE and achieving an astonishing QE of 100%. Also, their chrominance could be conveniently adjusted from blue to green through the white light region by increasing the amount of Tb3+. The optimal SBO:20% Ce3+, 15% Tb3+ glass also presents excellent thermal luminescence stability compared to commercial DS-200 phosphor. An assembled SBO-LED shows a bright greenish-white emission at 4 W of power.