Abstract
A common full-color method involves combining micro-light-emitting diodes (LEDs) chips with color conversion materials such as quantum dots (QDs) to achieve full color. However, during color conversion between micro-LEDs and QDs, QDs cannot completely absorb incident wavelengths cause the emission wavelengths that including incident wavelengths and converted wavelength through QDs, which compromises color purity. The present paper proposes the use of a recycling-reflection color-purity-enhancement film (RCPEF) to reflect the incident wavelength multiple times and, consequently, prevent wavelength mixing after QDs conversion. This RCPEF only allows the light of a specific wavelength to pass through it, exciting blue light is reflected back to the red and green QDs layer. The prototype experiment indicated that with an excitation light source wavelength of 445.5 nm, the use of green QDs and RCPEFs increased color purity from 77.2% to 97.49% and light conversion efficiency by 1.97 times and the use of red QDs and RCPEFs increased color purity to 94.68% and light conversion efficiency by 1.46 times. Thus, high efficiency and color purity were achieved for micro-LEDs displays.Graphical
Highlights
Displays change human reading habits and reduce the use of a lot of paper
The present paper proposes the use of an reflection color-purity-enhancement film (RCPEF) that combines red and green quantum dots (QDs) and blue micro-light-emitting diodes (LEDs)
RCPEF for Green QDs The blue micro-LEDs were converted from green QDs to green light
Summary
Displays change human reading habits and reduce the use of a lot of paper. All people and every industry need a monitor. Billboards, TV screens, mobile phones, household appliances, and car dashboards all use display applications. Display technical specifications are continually improved through research [1, 2]. The earliest display screens used cathode ray tubes (CRTs), with large size and high power consumption being major drawbacks [3]. Liquid–crystal displays (LCDs), which largely replaced CRTs, are thin and light. LCD screens cannot emit light, and the use of backlight and the emission of full-color pixels through color filters
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