ORGANIC LIGHT EMITTING DIODES (OLED)
Silviu POLOȘAN[1]
Abstract. Organic Light Emitting Diodes (OLED) now reach
the third phase concerning efficiency. The first devices are based on pure
organic materials, and the second and third generations are based on
combinations between metals and organic ligands in so-called organometallics
for which their emission external quantum efficiency is increased. The second
generation is now widely used in large displays reaching high efficiency
because of the spin-orbit coupling between metal and their ligands, which
induces intersystem crossing processes. The third generation of OLED comprises
an increased external quantum efficiency obtained by adequately choosing the
ligands, reaching a theoretical value of 100%. These OLEDs will be briefly
described with their advantages and the technologies necessary for
next-generation displays.
Keywords:
organic light emitting diodes, organic compounds
DOI
https://doi.org/10.56082/annalsarsciphyschem.2023.1.46
[1] Dr. Senior Researcher, National Institute
of Materials Physics, R-77125 Bucharest, Magurele,
Romania, member of Romanian Academy (e-mail:
silv@infim.ro )