Electroluminescence is the production of light with an electrical current, without relying on heat or chemical reactions. This makes electroluminescent lights reliable and highly efficient: they are used as backlights in digital watches and in the displays of Apollo space shuttle guidance computers. Like OLEDs, light-emitting electrochemical cells (LECs)—which emit light through electroluminescence—have undergone many technological advancements. Close examination of the processes that lead to luminescence is essential for improving luminescence efficiency, however, until now there has been no experimental method for examining these processes directly.
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Source: Phys.org