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UC-CPL from chiral ZIF⊃UCNP. (a) Simplified energy level diagram and energy-transfer upconversion process for the NaYF4:Yb, Er UCNPs. The spirals represent the detected UC-CPL in this work. (b) TEM image of L‐ZIF⊃UCNP : Er. (c) CPL spectra of L‐ZIF⊃UCNP : Er (dashed line) and D‐ZIF⊃UCNP : Er (solid line), λex = 980 nm laser.
