posted on 2023-11-21, 16:35authored byRuiqing Zhang, Huidong Xie, Qiyu Zhao, Zuobin Tang, Chang Yang, Binbin Su
Zero-dimensional (0D) hybrid metal halides are attractive
owing
to their distinctive structure as well as photoluminescence (PL) characteristics.
To discover 0D hybrid metal halides with high photoluminescence quantum
yield and good stability is of great significance for white light-emitting
diodes (LEDs). Herein, a novel hybrid antimony chloride (CTP)2SbCl5 is synthesized, which shows a bright broad-band
orange-red emission peaking at 620 nm under the low energy excitation
(365 nm), achieving an excellent photoluminescence quantum yield of
96.8%. In addition, (CTP)2SbCl5 shows an additional
emission peaking at 470 nm when excited at high energy (323 nm). PL
spectra and density functional theory results demonstrate that the
observed dual-band emission originates from the singlet and triplet
self-trapped excitons confined in isolated [SbCl5]2– square pyramids. Moreover, (CTP)2SbCl5 presents relatively superior air stability, and the PL intensity
still maintains 78% of the initial PL intensity when exposed to the
air for above 2 weeks. Benefiting from high-efficiency PL emission
and good stability of (CTP)2SbCl5, a stable
warm white LED device with a 92.3% color rendering index was prepared
by coating blue phosphor BaMgAl10O17:Eu2+, green (Sr,Ba)2SiO4:Eu2+, and orange-red (CTP)2SbCl5 on a 365 nm LED
chip. This work provides an efficient luminescent material and also
demonstrates the potential application of 0D hybrid antimony chloride
in solid-state lighting.