Nanosheet‐Based Microspheres of Eu³⁺‐doped ZnO with Efficient Energy Transfer from ZnO to Eu³⁺ at Room Temperature

Nanosheet-based microspheres of ZnO:Eu (see figure) are fabricated via pyrolysis of Zn5(OH)6(CO3)2 hierarchical microspheres. Efficient ZnO→Eu3+ energy transfer is observed, which is attributed to surface defects at the nonpolar [11?00] surface of a ZnO nanosheet that couples with Eu3+ and stabilizes the Eu2+ trap level just below the conduction band of ZnO.