Peter T. Kazlas

12.2: Invited Paper: Quantum Dot Light Emitting Diodes for Near-to-eye and Direct View Display Applications

Quantum dot light emitting diodes QLEDs are a printable thin film electroluminescent technology that can deliver exceptional color and efficiency at low cost of manufacture for display and solid-state lighting applications. However, while most literature reports focus on the performance of individual test pixels, examples of working display prototypes have been sorely lacking. We report on our progress developing QLEDs for near-to-eye and direct view display applications. Both a 4″ diagonal active-matrix bottom-emitting monochrome QLED display and an 800×600 SVGA top-emitting monochrome QLED microdisplay are reported on and their performance summarized. Contract printing of high-resolution RGB QDs is also demonstrated as a milestone towards full-color displays.

P-176: Progress in Developing High Efficiency Quantum Dot Displays

LED displays utilizing quantum dots (QDs) as emitters offer several key advantages over traditional OLEDs, combining the solution processability of polymers with the high efficiency potential of phosphors, all with the stability benefits of an inorganic emitter. While QD-LEDs are at an early stage in their development, the effort toward commercialization has already led to the identification of several considerations particular to QD-LEDs. This paper explores material and design considerations for QD-LEDs and reports our progress in developing QD-LEDs for information display and advanced applications.

32.4: Quantum Dot Light Emitting Diodes for Full‐color Active‐matrix Displays

Quantum dot light emitting diodes (QLEDs) are a printable thin film electroluminescent technology that delivers exceptional color and efficiency at low cost of manufacture for display and solid- state lighting applications. We report on our progress developing efficient, stable QLEDs for full-color active-matrix displays, including recent advances in device performance, lifetime and Cadmium-free QLEDs. Current QLED devices exhibit peak luminance efficiencies exceeding 50 cd/A, luminous power efficiencies greater than 20 lm/W and operational lifetimes exceeding 300 hours at 1,000 nits. Our most recent QLED efficiency results suggest that todays QLED performance is within a factor of two of the theoretical limit.

Quantum Dot Light Enhancement Substrate for OLED Solid-State Lighting

With DOE Award No. DE-EE00000628, QD Vision developed and demonstrated a cost-competitive solution for increasing the light extraction efficiency of OLEDs with efficient and stable color rendering index (CRI) for solid state lighting (SSL). Solution processable quantum dot (QD) films were integrated into OLED ITO-glass substrates to generate tunable white emission from blue emitting OLED) devices as well as outcouple light from the ITO film. This QD light-enhancement substrate (QD-LED) technology demonstrated a 60% increase in OLED forward light out-coupling, a value which increases to 76% when considering total increase in multi-directional light output. The objective for the first year was an 80% increase in light output. This project seeks to develop and demonstrate a cost-competitive solution for realizing increased extraction efficiency organic light emitting devices (OLEDs) with efficient and stable color rendering index (CRI) for SSL. Solution processible quantum dot (QD) films will be utilized to generate tunable white emission from blue emitting phosphorescent OLED (Ph-OLED) devices.