117
© Springer Nature Switzerland AG 2021
T. J. Gutiérrez (ed.), Reactive and Functional Polymers Volume Three,
https://doi.org/10.1007/978-3-030-50457-1_6
Chapter 6
Circularly Polarized Luminescent
Polymers: Emerging Materials
for Photophysical Applications
Puhup Puneet, Michiya Fujiki, and Bhanu Nandan
Abstract Circularly polarized luminescence (CPL) reflects the chiroptical
properties at the lowest excited state of the emitter. Thus, a wide range of applicability of these materials is in order, e.g. optical sensing. Polymeric systems possess
complex vibronic states in ground states and excited states, which presents a challenge to carefully design and amplify the CPL signals from functional polymers. In
this chapter, the fundamentals of CPL are briefly introduced followed by a review
of several π-conjugated and coordination polymers exhibiting CPL signals. In addition, the chiroptical properties will be discussed based on the CPL signals of the
polymer materials.
Keywords Circularly polarized luminescence · Optical polymers
6.1 Introductions
According to the quantum optics, light is the superposition of (l)-left and (r)-right
handed states of massless gauge bosons (photons) where each of these states has an
integer angular momentum of +ℏ and −ℏ (Beth 1936, Andrews 2011). The righthanded helical propagation of electric and magnetic vectors of light is referred to as
clockwise polarized wave and vice versa. The differential luminescence of (l)-left
and (r)-right handed light is known as a circularly polarized luminescence (CPL).
The CPL spectroscopy is nothing more than the luminescence of circular dichroism
P. Puneet · B. Nandan (*)
Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi, India
e-mail: nandan@textile.iitd.ac.in
M. Fujiki
Division of Materials Science, Graduate School of Science and Technology, Nara Institute of
Science and Technology, Nara, Japan
© Springer Nature Switzerland AG 2021
T. J. Gutiérrez (ed.), Reactive and Functional Polymers Volume Three,
https://doi.org/10.1007/978-3-030-50457-1_6
Chapter 6
Circularly Polarized Luminescent
Polymers: Emerging Materials
for Photophysical Applications
Puhup Puneet, Michiya Fujiki, and Bhanu Nandan
Abstract Circularly polarized luminescence (CPL) reflects the chiroptical
properties at the lowest excited state of the emitter. Thus, a wide range of applicability of these materials is in order, e.g. optical sensing. Polymeric systems possess
complex vibronic states in ground states and excited states, which presents a challenge to carefully design and amplify the CPL signals from functional polymers. In
this chapter, the fundamentals of CPL are briefly introduced followed by a review
of several π-conjugated and coordination polymers exhibiting CPL signals. In addition, the chiroptical properties will be discussed based on the CPL signals of the
polymer materials.
Keywords Circularly polarized luminescence · Optical polymers
6.1 Introductions
According to the quantum optics, light is the superposition of (l)-left and (r)-right
handed states of massless gauge bosons (photons) where each of these states has an
integer angular momentum of +ℏ and −ℏ (Beth 1936, Andrews 2011). The righthanded helical propagation of electric and magnetic vectors of light is referred to as
clockwise polarized wave and vice versa. The differential luminescence of (l)-left
and (r)-right handed light is known as a circularly polarized luminescence (CPL).
The CPL spectroscopy is nothing more than the luminescence of circular dichroism
P. Puneet · B. Nandan (*)
Department of Textile Technology, Indian Institute of Technology Delhi, New Delhi, India
e-mail: nandan@textile.iitd.ac.in
M. Fujiki
Division of Materials Science, Graduate School of Science and Technology, Nara Institute of
Science and Technology, Nara, Japan