High output efficiency (340 lm/W) in a one wavelength microcavity OLED with emitter layer positioned at an anti-node

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

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 c…

Efficiency and Stimulated Emission in Quarter Wave OLEDS

Quarter-wave OLEDS are microcavity devices that can operate in the low finesse limit and achieve high efficiency (> 300 lm/W) by using interference to reduce the onset current for the transition to stimulated emission. In this work we study the transition to stimulated emission and compare the kinetics and electrical properties of conventional and quarter-wave devices. We show that suppression of spontaneous emission into the vertical mode can result in a sharp transition to stimulated emission at (γ/eV)I ~ N_se/τ_sp where N_se/τ_sp is determined by optical parameters, and we find a previously…

Asymptotic Efficiency in OLEDS

Asymptotic efficiency (high output without droop) was recently reported for OLEDS in which a thin emitter layer is located at the anti-node in a resonant microcavity. Here we extend our theoretical analysis to treat multi-mode devices with isotropic emitter orientation. We recover our efficiency equations for the limiting cases with an isotropic emitter layer located at the anti-node where output is linear in current, and for an isotropic emitter located at the node where output can exhibit second order losses with an overall efficiency coefficient that depends on loss terms in competition wit…

超辐射有机发光二极管

Superradiant Organic Light-Emitting Diodes

本文通过使操作电压随发光体浓度缩放，在法布里-珀罗微腔 OLED 中触发稳态超辐射，实现亮度超扩展性集体增强、光谱窄化，使更少发光体在更低电压下达到或超过对照器件亮度，为高效显示与照明提供新途径。

最小化往返损耗以实现有机发光二极管的近100%量子效率

Minimizing round-trip loss for near-unity quantum efficiency in organic light-emitting diodes

该研究针对OLED外部量子效率停滞的问题，提出光提取多通过程的往返损耗是关键，通过添加低损耗辅助反射镜提升了EQE，推导设计规则预测可达90%的EQE。

Highly efficient polaritonic light emitting diodes with angle-independent narrowband emission

Angle-independent, narrowband emission is required for many optoelectronic devices, ranging from high-definition displays to sensors. However, emerging materials for electroluminescent devices, such as organics and perovskites, show spectrally broad emission due to intrinsic disorder. Coupling this emission to an optical resonance reduces the linewidth, but at the cost of inheriting the severe angular dispersion of the resonator. Strongly coupling a dispersionless exciton state to a narrowband optical microcavity could overcome this issue; however, electrically pumped emission from the resulti…