Abstract
Colloidal quantum dots (QDs) have gained tremendous attention as a
key material for highly advanced display technologies. The performance of
QD light-emitting diodes (QLEDs) has improved significantly over the past
two decades, owing to notable progress in both material development and
device engineering. The brightness of QLEDs has improved by more than
three orders of magnitude from that of early-stage devices, and has
attained a value in the range of traditional inorganic LEDs. The emergence
of high-luminance (HL) QLEDs has induced fresh demands to incorporate the
unique features of QDs into a wide range of display applications, beyond
indoor and mobile displays. Therefore it is necessary to assess the
present status and prospects of HL-QLEDs, to expand the application domain
of QD-based light sources. As part of this study, we review recent
advances in HL-QLEDs. In particular, based on reports of brightness
exceeding 105 cd/m2, we have summarized the major
approaches toward achieving high brightness in QLEDs, in terms of material
development and device engineering. Furthermore, we briefly introduce the
recent progress achieved toward QD laser diodes, being the next step in
the development of HL-QLEDs. This review provides general guidelines for
achieving HL-QLEDs, and reveals the high potential of QDs as a universal
material solution that can enable realization of a wide range of display
applications.
© 2020 Optical Society of Korea
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