Colloidal quantum dot light-emitting devices

Publication Type:

Journal Article

Source:

Nano Rev., Volume 1 (2010)

ISBN:

2000-5121

Keywords:

2010, 2013 and earlier, displays, lighting, nanocrystals, optoelectronics

Abstract:

Colloidal quantum dot light-emitting devices (QD-LEDs) have generated considerable interest for applications such as thin film displays with
improved color saturation and white lighting with a high color rendering
index (CRI). We review the key advantages of using quantum dots (QDs) in
display and lighting applications, including their color purity, solution
processability, and stability. After highlighting the main developments in
QD-LED technology in the past 15 years, we describe the three mechanisms
for exciting QDs - optical excitation, Förster energy transfer, and direct
charge injection - that have been leveraged to create QD-LEDs. We outline
the challenges facing QD-LED development, such as QD charging and QD
luminescence quenching in QD thin films. We describe how optical
downconversion schemes have enabled researchers to overcome these
challenges and develop commercial lighting products that incorporate QDs
to achieve desirable color temperature and a high CRI while maintaining
efficiencies comparable to inorganic white LEDs (>65 lumens per Watt). We
conclude by discussing some current directions in QD research that focus
on achieving higher efficiency and air-stable QD-LEDs using electrical
excitation of the luminescent QDs.