16.6.3 Supramolecular Polymer with Two Guest Monomers Based on
Pillararene
Huang et al. (2017) [45] prepared new fluorescent pillar[5]arene supramolecular
polymers based on host monomer H1 and two neutral guest monomers G1 and G2,
seen in Fig. 20. Linear supramolecular polymers with fluorescent character for
OLED fabrication were successfully prepared and confirmed by multiple methods.
As the doping strategy was successfully applied in these SPs, SP1 and SP2-3
exhibited blue-emitting and green-emitting, respectively, as expected. The efficient
energy transfer caused by the exciton trapping on narrow band gap guest G2 led to
an improvement on the PL efficiencies. Furthermore, the first OLED device utilizing
pillar[5]arene-based supramolecular polymers as the emissive layer. Maximum LEs
for SP1, SP2, and SP3 were achieved at 0.62, 3.88, and 4.88 cd A
À1 , respectively,
OH
O
O
O
O
N 3
N
N N
N
N
N
CN
N
N
N
CN
N
NC
O
O
O
O
O
O
O
O
O
O
H
H
H
H
H
H
H
H
S
S S
S
N
N
N
N
N
CN
CN
CN
CuI
OH
Br
K 2 CO 3
DMF 333 K
DMF 333 K
360 nm
387 nm
H1 H3
H2 H4
H4' H2'
H3' H1'
S1
S2
Z-G
E-G
1
H
Ha
III
III
III
Fig. 19 Chemical structures of the pillar[5]arene dimer (H) and the guest molecules (Z-G and
E-G). (Reprinted with permission from [44]. Copyright (2017) Royal Society of Chemistry)
16 Photoresponsive Supramolecular Polymers Based on Host-Guest Interactions
475