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Intrinsically Spin-Flip-Induced Circularly Polarized Electroluminescence: A Strategy Spanning Deep Blue to Deep Red
Jianxing Chen1, Zhe-Hong Su2, Denghui Liu3,4
1School of Materials Science and Engineering, Changzhou University, Changzhou, P. R. China.
Abstract:
Integrating circularly polarized electroluminescence (CPEL) into light-emitting diodes (LEDs) is crucial for advanced optical applications. However, its application is impeded by a longstanding trilemma involving a sufficient electroluminescence asymmetry factor (gEL), high external quantum efficiency (EQE), and narrow emission bandwidth. Here, a new strategy is proposed for generating CPEL in both circularly polarized organic light-emitting diodes (CP-OLEDs) and circularly polarized LEDs (CP-LEDs) by incorporating a chiral additive into the PEDOT:PSS ((3, 4-ethylenedioxythiophene):poly(styrene sulfonate)) hole-injection layer (HIL) to induce a spin-flipping. Consequently, solution-processable CP-OLEDs based on common achiral emitters achieve advantages of high gEL, high EQE, and excellent color purity. Comparing the original PEDOT:PSS based devices, improved maximum external quantum efficiency (EQEmax) of 17.2%, 20.3%, 12.0%, and 23.0% were obtained, with |gEL| of 2 × 10-2, 6 × 10-3, 1 × 10-2, and 1 × 10-3, for blue multi-resonance emitter, green phosphorescent emitter, and green multi-resonance emitters, respectively. This strategy enables deep-red perovskite-based CP-LEDs to deliver not only pronounced CPEL but also several-fold enhancements in performance. Angle-dependent CPEL measurements confirm the observed CPEL originating from spin-flip induction rather than polarization effects. This chiral additive HIL strategy establishes a universal platform for efficient CPEL across a wide range of achiral emitters and is applicable to both OLED and LED technologies.
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