High-efficiency
blue CdSe/ZnS quantum dots (QDs) have been synthesized
for display application with emission peak over 460 nm with the purpose
of reducing the harmful effect of short-wavelength light to human
eyes. To reach a better charge balance, different size ZnO nanoparticles
(NPs) were synthesized and electrical properties of ZnO NPs were analyzed.
Quantum dot light-emitting diodes (QLEDs) based on as-prepared blue
QDs and optimized ZnO NPs have been successfully fabricated. Using
small-size ZnO NPs, we have obtained a maximum current efficiency
(CE) of 14.1 cd A<sup>–1</sup> and a maximum external quantum
efficiency (EQE) of 19.8% for QLEDs with an electroluminescence (EL)
peak at 468 nm. To the best of our knowledge, this EQE is the highest
value in comparison to the previous reports. The CIE 1931 color coordinates
(0.136, 0.078) of this device are quite close to the standard (0.14,
0.08) of National Television System Committee (NTSC) 1953. The color
saturation blue QLEDs show great promise for use in next-generation
full-color displays
