Publication date: 15th December 2025
In this talk, colloidal synthesis of bright europium halide perovskite nanocrystals and their derivatives is presented.
Europium halide perovskites are promising candidates for environmentally-benign blue light emitters with their narrow emission linewidth. However, the development of high-photoluminescence quantum yield (PLQY) colloidal europium halide perovskite nanocrystals (PNCs) is hindered by the limited synthetic methods and the elusive reaction mechanisms. Here, we provide an effective synthetic route for achieving high-PLQY deep-blue-emitting colloidal CsEuBr3 PNCs. Using two Br-organic ligand precursors, oleylammonium bromide (OLAMHBr) and trioctylphosphine dibromide (TOPBr2), we identified distinct phase evolution routes involving Eu2+:CsBr, Cs4EuBr6, and CsEuBr3. The OLAMHBr precursor initially promotes the formation of Eu2+:CsBr phase, which reorganizes into the CsEuBr3 perovskite phase via proton transfer. In contrast, the TOPBr2 precursor induces the formation of core/shell Cs4EuBr6/CsBr PNCs, which subsequently transform into CsEuBr3 through nucleophilic addition. The TOPBr2 route exhibited enhanced CsEuBr3 phase homogeneity, resulting in a significantly higher PLQY (40.5%; full-width-at-half-maximum (FWHM) = 24 nm at 430 nm), compared to the OLAMHBr route (16.5% at 418 nm). Notably, the phase-pure CsEuBr3 PNCs demonstrated a world-record PLQY among the reported blue-emitting lead-free PNCs that exhibit a narrow emission linewidth (FWHM < 25 nm).[1] Our recent work on europium-doped metal halide nanocrystals will also be shortly presented, showing a high PLQY over 70% at pure-blue color range (458-476 nm). These works highlight the significant role of organic ligands (and halide precursors) in the colloidal synthesis of CsEuBr3 PNCs and their potential as non-toxic, solution-processable blue-light emitters.
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