一种非侵入式手性光学微腔结构实现高效率圆偏振量子点发光二极管OA

In circularly polarized light-emitting diodes(CP-LEDs),it has been difficult to obtain both a high lumi-nescence dissymmetry factor(glum)and a high external quantum efficiency(EQE)simultaneously.This limitation stems from conventional approaches,which typically employ intrinsically chiral emitters or chiral charge-transport layers modifications that often degrade charge transport and radiative recombination within the device.To overcome these issues,we introduce a non-invasive and decoupled structural design.Here,a chiral optical microcavity(COM)-formed by a double-layer chiral liquid crystal(CLC)and a metal reflector-creates a macroscopic chiral photonic envi-ronment around an otherwise non-chiral,high-efficiency quantum dot light-emitting unit.Without modifying the emit-ter or the charge-injection interfaces,this configuration enables effective control over the circular polarization of the output light.The mechanism relies on the synergy between the selective reflection of the CLC and the mode reso-nance of the Fabry-Pérot microcavity.Inside the cavity,emitted light undergoes repeated chiral-selective interac-tions and mode-selective amplification,greatly enhancing the intensity difference between left-and right-handed com-ponents-far beyond what a simple chiral filter could achieve.Using this design,we fabricated a red CP-QLED that reaches a glum≈0.75 while maintaining a high EQE of 24.3%and a luminance of approximately 194 468 cd/m2 at 8 V.These results demonstrate a practical route to decoupling chiral function from emission efficiency through macroscop-ic photonic engineering.Overall,this work provides a scalable strategy that combines functional materials with tai-lored photonic structures for high-performance circularly polarized electroluminescence.It offers a useful reference for the development of future full-color CP-QLED displays and integrated optoelectronic systems.