posted on 2021-02-09, 08:47authored byMengdi Li, Xiangyi Huang, Jicun Ren
Chemiluminescence (CL) resonance
energy transfer (CRET) has received great attention due to its fascinating
applications in in vivo imaging and photodynamic
therapy. Here, we report a highly efficient CRET polymer dot (CRET-Pdots)-based system using catalytic CL reagents as energy
donors and fluorescent polymers and dyes as energy acceptors. CRET-Pdots consist of Fe(III) deuteroporphyrin IX (CL catalyst),
fluorescent polymers, and dyes. The CL intensity and duration are
markedly enhanced by using ultrasensitive catalytic CL reaction of
luminol analogue-H2O2, and the CL emission wavelength
can be adjusted by one-step/two-step energy-transfer strategies. CRET-Pdots show intensive multicolor CL (about 3000×
enhanced), an adjustable emission wavelength (470–720 nm),
long CL duration (over 8 h), and a high CRET efficiency (50%). CRET-Pdots possess excellent biocompatibility, sensitive response
to reactive oxygen species (ROS), and ultrahigh catalytic activity.
They are successfully used for high-contrast real-time ROS imaging
and in vivo tumor-targeted imaging with an excellent
signal-to-noise ratio (over 90).