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Article Abstract
Alloying lanthanide ions (Yb) into perovskite quantum dots (Yb:CsPb(ClBr)) is an effective method to achieve efficient near-infrared (NIR) luminescence (>950 nm). Increasing the Yb alloying ratio in the perovskite matrix enhances the luminescence intensity of Yb emission at 990 nm. However, high Yb alloying (>15%) results in vacancy-induced inferior material stability. In this work, we developed a polarity-mediated antisolvent manipulation strategy to resolve the incompatibility between a high Yb alloying ratio and inferior stability of Yb:CsPb(ClBr). Precise control of solution polarity enables increased uniformity of the perovskite matrix with fewer trap densities. Employing this strategy, we obtain Yb:CsPb(ClBr) with the highest Yb alloying ratio of 30.2% and a 2-fold higher electroluminescence intensity at 990 nm. We lever the engineered Yb:CsPb(ClBr) to fabricate NIR-LEDs, achieving a peak external quantum efficiency (EQE) of 8.5% at 990 nm: this represents the highest among perovskite NIR-LEDs with an emission wavelength above 950 nm.
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| http://dx.doi.org/10.1021/acs.nanolett.3c04586 | DOI Listing |
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