Enhancing hole carrier injection via low electrochemical doping on circularly polarized polymer light-emitting diodes

Abstract

Circularly polarized electroluminescence (CP-EL) from a blend system of chiral small-molecule additives and device optimised achiral π-conjugated polymers (π-CPs) is of great interest for next-generation display technologies. However, CP polymer...

Advances in circularly polarized luminescence materials based on helical polymers

“…They have a g EL of À0.65 and 0.3, respectively. 81,82 These results indicate that F8BT with chiral helical structure has great application potential in CP-OLED. [78][79][80]82 In 2020, Zou et al found that after the irradiation of left-handed or right-handed CPL light, the CPL signal can be measured from achiral luminescent polymer F6BT.…”

“…81,82 These results indicate that F8BT with chiral helical structure has great application potential in CP-OLED. [78][79][80]82 In 2020, Zou et al found that after the irradiation of left-handed or right-handed CPL light, the CPL signal can be measured from achiral luminescent polymer F6BT. 83 The intensity and direction of the generating CPL signal are strongly influenced by the polarization direction and irradiation wavelength of the chiral source CPL light.…”

“…They have a g EL of −0.65 and 0.3, respectively. 81,82 These results indicate that F8BT with chiral helical structure has great application potential in CP-OLED. 78–80,82…”

Probing the nature of charge carriers in one-dimensional conjugated polymers: a review of the theoretical models, experimental trends, and thermoelectric applications

“…At first, holes or electrons are generated in the valence band and the conduction band of the conjugated polymer by redox doping, photoexcitation, or charge injection, respectively. [28][29][30] Subsequently, the holes or electrons would distort the nearby lattice structures to lower their energy levels, forming localized topological excitons, e.g., soliton, polaron, bipolaron, as the charge carriers. Based on the reduction of energy by lattice distortion, the energy levels of the charge carriers from high to low can be written as soliton 4 polaron 4 1 2 bipolaron.…”

Amplification of dissymmetry factors by dihedral angle engineering in donor–acceptor type circularly polarized luminescence materials

“…In particular, various CPL materials have been developed for electroluminescent applications in circularly polarized organic light-emitting diodes (CP-OLEDs). [19][20][21][22][23][24][25][26] How to realize a high luminescence dissymmetry factor (g lum ), which characterizes the level of polarization and is defined by g lum = 2(I L À I R )/(I L + I R ) (where I L and I R are the emission intensity of left-handed and right-handed circularly polarized light, respectively), has been the key challenge in the field to promote the practical applications of CPL materials.…”