Two new phosphine
ligands, diphenylmethylphosphine (DPMP) and triphenylphosphine
(TPP), were introduced onto cesium lead bromoiodide nanocrystals (CsPbBrI
2
NCs) to improve air stability in the ambient atmosphere.
Incorporating DPMP or TPP ligands can also enhance film-forming and
optoelectronic properties of the CsPbBrI
2
NCs. The results
reveal that DPMP is a better ligand to stabilize the emission of CsPbBrI
2
NCs than TPP after storage for 21 days. The increased carrier
lifetime and photoluminescence quantum yield (PLQY) of perovskite
NCs are due to the surface passivation by DPMP or TPP ligands, which
reduces nonradiative recombination at the trap sites. The DPMP and
TPP-treated CsPbBrI
2
NCs were successfully utilized as
red emitters for fabricating perovskite light-emitting diodes with
enhanced performance and prolonged device lifetime relative to the
pristine one.
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