QLED Introduction

What is a QLED or QDLED?

QD LED or QLED is considered as a next generation display technology after OLED-Displays.
QLED means Quantum dot light emitting diodes and are a form of light emitting technology and consist of nano-scale crystals that can provide an alternative for applications such as display technology. The structure of a QLED is very similiar to the OLED technology. But the difference is that the light emitting centers are cadmium selenide (CdSe) nanocrystals, or quantum dots. A layer of cadmium-selenium quantum dots is sandwiched between layers of electron-transporting and hole-transporting organic materials. An applied electric field causes electrons and holes to move into the quantum dot layer, where they are captured in the quantum dot and recombine, emitting photons. The spectrum of photon emission is narrow, characterized by its full width at half the maximum value.

There are two major fabrication techniques for QD-LED, called phase separation and contact-printing.
QLEDs are a reliable, energy efficient, tunable color solution for display and lighting applications that reduce manufacturing costs, while employing ultra-thin, transparent or flexible materials.

QLEDs advantages:

  • Pure color — Will deliver 30-40% luminance efficiency advantage over organic light emitting diodes (OLEDs) at the same color point.
  • Low power consumption — QLEDs have the potential to be more than twice as power efficient as OLEDs at the same color purity.
  • Low-cost manufacture — The ability to print large-area QLEDs on ultra-thin flexible substrates will reduce luminaire manufacturing cost.
  • Ultrathin, transparent, flexible form factors — QLEDs will enable designers to develop new display and lighting forms not possible with existing technologies.

Source:QD-Vision Wikipedia