QLEDs for displays and solid-state lighting

Publication Type:

Journal Article

Source:

MRS Bull., Cambridge University Press, Volume 38, Issue 09, p.703-711 (2013)

ISBN:

0883-7694

Keywords:

2013, 2013 and earlier, Colloidal quantum-dot, light-emitting device, nanotechnology, solid-state lighting

Abstract:

The mainstream commercialization of colloidal quantum dots (QDs) for light-emitting applications has begun: Sony televisions emitting
QD-enhanced colors are now on sale. The bright and uniquely size-tunable
colors of solution-processable semiconducting QDs highlight the potential
of electroluminescent QD light-emitting devices (QLEDs) for use in
energy-efficient, high-color-quality thin-film display and solid-state
lighting applications. Indeed, this year’s report of record-efficiency
electrically driven QLEDs rivaling the most efficient molecular organic
LEDs, together with the emergence of full-color QLED displays, foreshadow
QD technologies that will transcend the optically excited QD-enhanced
products already available. In this article, we discuss the key advantages
of using QDs as luminophores in LEDs and outline the 19-year evolution of
four types of QLEDs that have seen efficiencies rise from less than 0.01%
to 18%. With an emphasis on the latest advances, we identify the key
scientific and technological challenges facing the commercialization of
QLEDs. A quantitative analysis, based on published small-scale synthetic
procedures, allows us to estimate the material costs of QDs typical in
light-emitting applications when produced in large quantities and to
assess their commercial viability.