posted on 2022-01-04, 16:04authored byYanqing Luo, Tao Tan, Sen Wang, Ran Pang, Lihong Jiang, Da Li, Jing Feng, Hongjie Zhang, Su Zhang, Chengyu Li
Enhancements
of the photoluminescence quantum yield (PL QY) and
photochemical stability are critical factors for quantum dots (QDs)
in the organic phase. In this article, we presented a flexible synthesis
protocol for cadmium telluride (CdTe) QDs via controlling X-type ligands
(3-methyl-benzoyl chloride), which simultaneously served as third-party
initiators of the nucleation-growth process and surface ligand provider
(Cl–). The synthetic reaction was triggered at 100
°C, and the PL QY could reach up to 85%. It was discovered for
the first time that the conversions between different sizes of magic-size
clusters (MSCs) and QDs were sensitively induced by initiator stoichiometry.
The obtained CdTe QDs possessed a zinc blende structure with a tetrahedral
morphology and a narrow full width at half-maximum and covered the
fluorescent window from 510 to 700 nm. The results showed that the
CdTe QD surface was capped with resident oleylamine, thioalcohol,
and a dynamically bound initiator (Cl–). The prepared
white-light-emitting diode (WLED) device based on CdTe QDs showed
a high correlated color temperature (CCT), Ra, and CIE chromaticity
coordinates of 5435 K, 93, and (0.334, 0.3498), respectively. This
work will unlock the inspiration for the synthesis and application
of other telluride QDs.