Phosphorescent organic light emitting diodes (PHOLEDs) feature high efficiency, brightness, and color tunability suitable for both display and lighting applications. However, overcoming the short operational lifetime of blue PHOLEDs remains possibly the most challenging problem in the field of organic electronics. Their short lifetimes originate from the annihilation of high energy, long-lived blue triplets that leads to molecular dissociation. Here, we introduce the polariton-enhanced Purcell effect to reduce the triplet density, and hence the probability for destructive high-energy triplet-polaron (TPA) and triplet-triplet annihilation (TTA) events. Besides the common optical modes in conventional devices, we couple triplets to plasmon-exciton-polaritons and cavity modes to significantly increase the strength of the Purcell effect. We achieve a four-fold improvement in LT95 (time to 95% of the initial luminance) of a blue PHOLED with a Purcell factor of 2.4. Furthermore, the chromaticity coordinates of a cyan emitting Ir-complex were shifted to (0.14, 0.14), a deep blue color suitable for displays. The power law between lifetime enhancement and the Purcell factor is between 1.4 and 2.2, suggesting contributions to degradation from both TPA and TTA. The polariton-enhanced Purcell effect and microcavity engineering provide new possibilities for extending the PHOLED lifetime, particularly in the deep blue spectral range essential for wide color gamut displays.
Semi-transparent organic photovoltaics (ST-OPVs) are considered as an attractive solution for power-generating windows. Typically, the module geometric fill factor (GFF) is limited by low-resolution patterning approaches. Here, we demonstrate a solvent-free polymer-based peel-off patterning method, which can achieve the resolution of photolithographic patterning of chemically sensitive organic materials. An ~13 cm² ST-OPV module fabricated using this method, achieves GFF > 95%, and a power conversion efficiency approaching 8% which shows less than 10% loss compared to a 4 mm² device. This method enables a viable path for achieving ST-OPVs at larger scales.
A thermophotovoltaic (TPV) cell is specially designed to minimize the absorption of radiation below its lowest bandgap. This ensures that the unused power is returned to the hot thermal emitter, which keeps it from being wasted. This approach is termed photon recycling because the energy is recycled until it is emitted at a high enough frequency to be efficiently converted. To facilitate this process, we recently created a cell architecture that has a thin air layer behind the light-absorbing semiconductor. The resulting air-bridge cell (ABC) reflects back almost all of the low-energy photons. In this talk, I will discuss the development of an InGaAs ABC that achieved a record-high peak conversion efficiency of 32% and our recent efforts to improve performance.
State-of-the-art TPV converters use cells with high out-of-band reflectance to facilitate a photon recycle process, in which sub-bandgap photons are reflected by the cell and subsequently re-absorbed at the emitter. However, cells relying on metallic back surface reflectors, Bragg/plasma filters, and photonic crystals for spectral control suffer from undesired out-of-band absorptance and have yet to surpass 95% out-of-band reflectance. Here we describe the fabrication and characterization of a thin-film In0.53Ga0.47As thermophotovoltaic cell with an air-bridge architecture, in which the absorber material is suspended over an air gap, supported by Au grid lines. The average out-of-band reflectance of the cell exceeds 98% due to lossless Fresnel reflectance at the In0.53Ga0.47As-air interface and < 2% loss at the air-Au interface. The result is a record-high TPV conversion efficiency of 32%, characterized under illumination by a 1455K SiC globar.
Thermophotovoltaic (TPV) cells utilize locally emitted thermal radiation to generate electricity. To reach high efficiencies, the unusable spectrum (the below bandgap, or out-of-band spectrum) of the thermal source must be recycled to the source. Current approaches for photon recycling use back-surface reflectors or front surface filters, however, these have not exceeded 95 % out-of-band reflectance. In this work, we demonstrate an out-of-band reflectance of ~99% in a thin-film In0.53Ga0.47As TPV using an air-bridge as photon reflector, which effectively eliminates out-of-band absorption losses. The nearly perfect photon utilization enables a record high TPV power conversion efficiency of over 31% measured with a 1500K blackbody emitter.
The retina employs a unique hemispherical architecture that provides a low-aberration image with wide field of view. However, owing to established optoelectronic fabrication technologies, conventional imagers are limited to a planar architecture. Despite that limitation, intensive endeavors have been made on mimicking the hemispherical detector geometry. The most critical limitation of the existing approaches is the increased spacing between adjacent detectors on deformation to form non-developable three-dimensional array surfaces. Here, we demonstrate retina-like imagers that do not suffer from pixel spacing enlargement upon transforming into the desired three-dimensional hemispherical shape. The approach employs fabrication processes that are generally employed for optoelectronics on planar flexible plastic foils followed by the unique elongation-free conformal deformation on an elastomeric transfer handle. Using these methods, we demonstrate hemispherical imagers with high optical performance, high yield, and, importantly, unchanged pixel density upon deformation and transformation from a developable two-dimensional to a non-developable three-dimensional surface. This approach is compatible with batch fabrication of imagers with many high performance crystalline materials including but not limited to Si, GaAs, InGaAs, and etc. The demonstrated methods provide a practical path of making high pixel density imaging system on non-developable surfaces.
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