Chip-scale white flip-chip light-emitting diode containing indium phosphide/zinc selenide quantum dots

Abstract

A method for preparing a quantum dot (QD)-white light-emitting diode (WLED) is reported. Holes were etched in the SiO2 layer deposited on the sapphire substrate of the flip-chip LED by inductively coupled plasma, and these holes were then filled with QDs. An ultraviolet-curable resin was then spin-coated on top of the QD-containing SiO2 layer, and the resin was cured to act as a protecting layer. The reflective sidewall structure minimized sidelight leakage. The fabrication of the QD-WLED is simple in preparation and compatible with traditional LED processes, which was the minimum size of the WLED chip-scale integrated package. InP/ZnS core-shell QDs were used as the converter in the WLED. A blue light-emitting diode with a flip-chip structure was used as the excitation source. The QD-WLED exhibited color temperatures from 5900 to 6400 K and Commission Internationale De L'Elcairage color coordinates from (0.315, 0.325) to (0.325, 0.317), under drive currents from 100 to 400 mA. The QD-WLED exhibited stable optoelectronic properties.

High-performance quantum dot light-emitting diodes using chip-scale package structures with high reliability and wide color gamut for backlight displays

“…The excellent color distribution uniformity was attributed to the reflective sidewall (side silicone resin) of the CSP, which reduced the amount of the side-emitted light (blue-ring effect). 22,23 These results indicated that the CSP may have a potential in illumination applications that require high color uniformity.…”

Improving the luminescence performance of quantum dot masterbatch to optimize the white light emission of diffuser plate

“…However, in actual manufacturing, white LED is generally realized by blue LED chips and yellow phosphor [4] . The white light obtained from backlight structure realized in this way is missing in the red light band and has a low color gamut range [5] . Another method to create white light is to combine a blue chip with two other types of QDs, red and green [6] .…”