{"id":209,"date":"2024-10-16T18:21:51","date_gmt":"2024-10-16T18:21:51","guid":{"rendered":"https:\/\/seegroup.mit.edu\/?page_id=209"},"modified":"2025-06-07T19:21:23","modified_gmt":"2025-06-07T19:21:23","slug":"light-emitting-devices","status":"publish","type":"page","link":"https:\/\/seegroup.mit.edu\/index.php\/light-emitting-devices\/","title":{"rendered":"Light Emitting Devices"},"content":{"rendered":"

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Research: Light Emitting Devices<\/strong><\/h2>\n

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Figure: A Deep Blue Phosphorescent OLED in a strong magnetic field<\/em><\/p>\n

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Main Research Areas<\/p>\n

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Solar Cells<\/a><\/p>\n

Light Emitting Devices<\/a><\/p>\n

Gas Sensing<\/a><\/a><\/p>\n

Spintronics for Computation<\/a><\/p>\n

Photon Upconversion and Downconversion<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Organic light emitting devices (OLEDs) are a highly promising emissive technology for flat panel displays. OLEDs employ soft organic semiconductors to convert injected charge into luminescent excitons, in a process known as electroluminescence. But in order to be widely adopted, OLEDs must not only match the color purity and long-term stability of competing technologies, they must realize their maximum potential efficiency.<\/span><\/span><\/p>\n

We have focused on the efficiency of electroluminescence, and particularly the effects of spin on exciton formation in organic semiconductors. We have measured the fundamental efficiency limits in OLEDs and demonstrated a new method for improving performance that we term \u2018extrafluorescence\u2019.<\/span><\/p>\n

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We have demonstrated a new method for obtaining high efficiency blue OLEDs and developed a novel technique for analyzing the optical properties of OLEDs.<\/p>\n

We have also developed a novel method for patterning thin films of organic semiconductors.<\/p>\n

In our most recent research, we proposed that OLED stability can be improved by rapidly converting excitons to light, thereby reducing the energy stored in the devices.\u00a0<\/p>\n

Applying this technique to high-performance blue phosphorescent OLEDs, we demonstrated significant improvements to device lifetime. We also observed the presence of significant populations of \u2018dark triplets\u2019 that cause degradation by storing energy in the host and blocking layers of OLEDs. Addressing the dynamics of dark triplets is a major direction for our current research.<\/p>\n

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See our work on:<\/p>\n