P‐120: Degradation Mechanism and Lifetime Improvement of Blue Quantum‐Dot Light‐Emitting Diodes

Abstract

We have demonstrated that degradation of the hole-transporting layer material in the blue quantum-dot light-emitting diode (QLED) is the main reason accounts for the efficiency loss operated under constant current driving, and the operation lifetime can be elongated by 85% under pulse-mode driving compared to DC case.Keywords QLED, blue emission, lifetime. Figure 3. (a) PL spectra of QLED excited at 340 nm. PL spectra of QLED excited at 420 nm with different HTL thickness: (b) 0 nm, (c) 7 nm, (d) 14 nm, and (e) 28 nm.Figure 4. Enhancement factor for the QLED drive by pulsemode with 10 kHz and different duty cycle.

65‐3: Green Top‐emission Quantum Dot Light‐emitting Diodes (TE‐QLED) with Normal and Inverted Structure

“…Typically, the commercial product is utilizing of top-emission device because of aperture ratio issue. In general, aperture ratio of top emission is better than bottom-emission [12][13][14][15][16][17].…”

Lifetime elongation of quantum-dot light-emitting diodes by inhibiting the degradation of hole transport layer

“…Colloidal quantum dots (QDs) have been widely investigated due to their attractive characteristics, such as high photoluminescence quantum yield, low driving voltage, narrow full width at half maximum of the emission spectra, high color purity, tunable emission color, and cost-effective fabrication. [1][2][3][4][5][6][7][8][9][10] These characteristics make QDs potential electroluminescence (EL) material in quantum-dot light-emitting devices (QDLEDs) and a promising candidate for nextgeneration wide-color-gamut displays and solid-state lighting applications. Depending on the size and composition of QDs, the quantum connement effect allows them to modulate the emissive color to cover wavelengths ranging from the ultraviolet (UV) region to the near-infrared (NIR) region.…”