Abstract
We have developed a high efficiency and deep blue organic
light-emitting diodes (OLEDs) incorporating a
4-hydroxy-8-methyl-1,5-naphthyridine aluminum chelate
(AlmND<sub>3</sub>) as the emitter and electron transporting
layer (ETL). The blue AlmND<sub>3</sub> emitter, with an electron
withdrawing group added to the well-known green fluorophore
tris(8-hydroxyquinolinato)aluminum (Alq<sub>3</sub>), exhibited
ambipolar charge transport as well as high electron and hole
mobilities on the order of 10<sup>-5</sup> cm<sup>2</sup>/V·s, as deduced
time-of-flight measurements. The magnitude of the electron mobility
was 10 times greater than that of the widely used Alq<sub>3</sub>
ETL, resulting in efficient charge balance in the
AlmND<sub>3</sub> device. Based on a simple configuration of
double heterojunction device, a blue device with the maximum
external quantum efficiency of 1.58% and Commission Internationale
de l'Eclairage (CIE) coordinates of (0.16, 0.08) was achieved at a
brightness of 200 cd/m<sup>2</sup>. This study has revealed the
fundamental nature of charge transport in hydroxynaphthyridine metal
chelate and shed a new light on the design of high performance blue
OLEDs.
© 2011 IEEE
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