Organic LEDs (OLEDs) in mobile displays have been in large-scale
production for over a decade, and OLED-based televisions are
rapidly gaining traction in the marketplace. OLEDs are on the verge
of entering the solid-state lighting market in a big way. The OLED
technology gives higher color purity and is more efficient than any
of the competing technologies. When produced at scale, OLEDs are
also economical. A key limitation in the development of OLEDs was
the efficient conversion of all of the electrical energy put into
the device into light. Until the late 1990s, the maximum efficiency
of OLEDs was limited to 25% (photons/electrons), but this
limitation was removed and OLEDs with 100% efficiency were reported
in the early 2000s. This advance in OLED technology was driven by
the author of this book. He and his collaborators developed
electrophosphorescence, which is essential in reaching the 100%
efficiency that is now commonplace in commercial devices.
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