Circularly polarized electroluminescence from a single-crystal organic microcavity light-emitting diode based on photonic spin-orbit interactions

Abstract

Circularly polarized (CP) electroluminescence from organic light-emitting diodes (OLEDs) has aroused considerable attention for their potential in future display and photonic technologies. The development of CP-OLEDs relies largely on chiral-emitters, which not only remain rare owing to difficulties in design and synthesis but also limit the performance of electroluminescence. When the polarization (pseudospin) degrees of freedom of a photon interact with its orbital angular momentum, photonic spin-orbit interaction (SOI) emerges such as Rashba-Dresselhaus (RD) effect. Here, we demonstrate a chiral-emitter-free microcavity CP-OLED with a high dissymmetry factor (gEL) and high luminance by embedding a thin two-dimensional organic single crystal (2D-OSC) between two silver layers which serve as two metallic mirrors forming a microcavity and meanwhile also as two electrodes in an OLED architecture. In the presence of the RD effect, the SOIs in the birefringent 2D-OSC microcavity result in a controllable spin-splitting with CP dispersions. Thanks to the high emission efficiency and high carrier mobility of the OSC, chiral-emitter-free CP-OLEDs have been demonstrated exhibiting a high gEL of 1.1 and a maximum luminance of about 60000 cd/m2, which places our device among the best performing CP-OLEDs. This strategy opens an avenue for practical applications towards on-chip microcavity CP-OLEDs.

Chiral electroluminescence from thin-film perovskite metacavities

“…This is smaller than the peak DCP value in Fig. 5, but it is still substantially larger than the previous EL DCP values in perovskite materials (36)(37)(38). Our experimental and theoretical studies demonstrate that Fabry-Pérot cavities with tailored mirror responses can be exploited in a clever way to improve the characteristics of the chiral light sources.…”

High Comprehensive Circularly Polarized Electroluminescence Performance Improved by Chiral Coassembled Host Materials

“…[14][15][16][17][18][19] Although more and more efforts have been focused on providing innovative molecular designs and novel strategies, most of the reported devices have until now suffered from low electroluminescence asymmetry factor (g EL ) values in the 10 −5 -10 −3 order of magnitude, seriously limiting their potential application. [20][21][22][23] Hence, developing CP-OLEDs with a highly comprehensive performance is challenging but of great significance.…”

Circularly Polarized Luminescent Behavior of Delayed Fluorescence Liquid Crystals Based on Carbonized Polymer Dots

“…Circularly polarized luminescent (CPL) materials possessing high-efficiency energy conservation can directly generate circularly polarized light without complex fabrication of the traditional circularly polarized light device, which shows essential applications in biomedical imaging, [1][2][3][4] optical data storage, [5,6] organic light-emitting diodes, [7] 3D displays, [8][9][10] chiral sensing, [11] and DOI: 10.1002/adom.202300816 so on. Generally, the materials with simultaneous chiral and luminescent properties further assembly into supramolecular ordered structures, which consequently results in CPL behavior or other photonic phenomena.…”