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(Zoom online) The 950th IMS colloquium

Lecture Title “Organic Light Emitting Diode – A review ”
Date Thursday 6 May 2021 16:00 to 17:30
Lecturer Chair Professor Ching Wan Tang (Institute for Advanced Study Hong Kong University of Science and Technology)

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Organic Light Emitting Diode (OLED) is a major optoelectronics technology today. It is the first light-emitting device based solely on organic semiconductors that has achieved a performance in efficiency and color fidelity matching or even exceeding those of the conventional inorganic III-V LED . For applications, OLED as a thin-film device offers important advantages over the crystalline LED in terms of manufacture scalability. Whereas the growth of LED is generally limited to small-size wafers up to 4” and requires a high temperature for processing, thin-film OLED is readily produced on large-area glass plates measuring in square meters at or near room temperature. For assembling or patterning to form pixel arrays over a large area, unlike LED where the array resolution is generally limited to 100 ppi (pixel per inch) by a pick-and-place assembly method, OLED can be monolithically patterned to achieve a resolution well exceeding 1000 ppi. For these reasons, they both found their ubiquitous applications - LED for general lighting, and OLED for high-resolution displays of various sizes. Furthermore, for display applications OLED, being self-emissive, can achieve extremely low black levels far beyond what is achievable by the liquid crystal display (LCD) - the currently dominant display technology. As a result, OLED display is naturally superior to LCD in picture quality, and in conjunction with a flexible form factor, it is being adopted for applications beyond smartphones and TVs to laptops and wearables such as headsets for virtual reality.

In this review I will trace the development of OLED from its serendipitous discovery in late 1970s at the Kodak Research Laboratory to its evolution as a premium display technology in recent years. I will highlight some major scientific advances in OLED materials and devices that led to nearly unity quantum efficiency in light emission and a useful lifetime in tens of thousands of hours, along with an assessment of the future of OLED displays in view of the industry’s competitive landscape.


Download the PDF here.


If you would like to participate, please register from the following URL.

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Only registered persons can participate in this colloquium.


Tetsuro Kusamoto, Emi Minamitani (IMS colloquium FY2021 committee)