Ocean Quantum Dots for Flexible Optoelectronics
Ocean NanoTech’s quantum dots were used for the demonstration of mechanically flexible quantum dot light emitting diodes (QD-LEDs) for the three colors: red, green, and blue. The QD-LEDs were fabricated over polyethylene-terephthalate substrates and exhibited high brightness, saturated colors, and pronounced flexibility with a critical bending radius of 5 mm. The efficiencies of the flexible QD-LEDs were comparable with the devices fabricated on rigid substrates, suggesting the intrinsic flexibility of quantum dot-based optoelectronic devices.
The fabricated ITO pre-coated PET substrates that were used to generate the flexible devices that were RGB-emitting QD-LEDs exhibited high brightness and saturated colors. The efficiencies of the flexible QD-LEDs were close to or comparable with the QDLEDs fabricated on glass substrates. The maximum luminance and luminous efficiency reached 7070 Cd/m2 and 2.57 Cd/A for the red device, 3375 Cd/m2 and 2.32 Cd/A for the green device, and 1408 Cd/m2 and 0.40 Cd/A for the blue device, which were comparable with the best performances of the QD-LEDs fabricated on glass substrates. More importantly, the flexible QD-LEDs exhibited a small critical bending radius down to 5 mm, which was sufficient for possible applications in large area, roll-up, or conformable flat panel displays that can be manufactured with roll-to-roll processes. These represent an important step toward the development of flexible QD optoelectronics.
For more information on Ocean’s quantum dot based LEDs please click here.
*Zhanao Tan,Jian Xu,Chunfeng Zhang, Ting Zhu, Fan Zhang, Brittany Hedrick, Shawn Pickering,Jian Wu, Huaipeng Su, Shuai Gao, Andrew Y. Wang, Brian Kimball, Jerzy Ruzyllo, Nicholas S. Dellas, and Suzanne E. Mohney, “Colloidal nanocrystal-based light emitting diodes fabricated on plastic toward flexible quantum dot optoelectronics,” Journal of Applied Physics, 105, 034132-034136, 2009.