Structural control of the photoluminescence of silole regioisomers and their utility as sensitive regiodiscriminating chemosensors and efficient electroluminescent materials.
We synthesized a group of silole regioisomers 1(x,y), whose photoluminescence varied dramatically with its regiostructure. By internally hindering the intramolecular rotation, we succeeded in creating a novel silole (1(3,4)) that is strongly luminescent in solutions and whose fluorescence quantum yield in acetone is as high as 83%. We revealed that 1(3,4) was a sensitive chemosensor capable of optically discriminating nitroaromatic regioisomers of p-, o-, and m-nitroanilines. Against general belief, crystal formation of 1(2,4) blue-shifted its emission color and boosted its emission efficiency. The light-emitting diode based on the crystal of 1(2,4) emitted a strong blue light (464 nm) in a high current efficiency (5.86 cd/A).
Li
Zhen
Z
Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Dong
Yongqiang
Y
Mi
Baoxiu
B
Tang
Youhong
Y
Häussler
Matthias
M
Tong
Hui
H
Dong
Yuping
Y
Lam
Jacky W Y
JW
Ren
Yan
Y
Sung
Herman H Y
HH
Wong
Kam S
KS
Gao
Ping
P
Williams
Ian D
ID
Kwok
Hoi Sing
HS
Tang
Ben Zhong
BZ