|Utilizing Mn4+ doped metal-oxides nanoparticles to enhance color rendering index and heat dissipation for high performed white-LED
|Research hosting institution
|Institute of Chemical Technology
|Project leader’s name
|Nguyen Hoang Duy
|01/01/2021 - 31/12/2022
|600 million VND
|Goal and objectives of the project
Synthesis of red-emitting Mn4+ doped metal-oxide solutions for improving heat dissipation, color rendering and quantum efficiency of nanowire InGaN-LED (>100 micrometers in size).
- Theoretical results: The possibility of combining nanowire-InGaN blue-LEDs with down-converted nanophosphor has been studied. Red-emitting Al2O3:Mn4+,Mg2+ (~32 nm) nanosheets and Mg2(Ti/Si)O4:Mn4+ nanoparticles (~14 nm) are preapred. The calcined phosphors at 500-1300 °C exhibited high emission intensity, low thermal quenching and excellent water resistance. A warm white LED with a high colour rendering index (CRI ~95) and a low CCT ~5000-3000 K is fabricated using the nanophosphors and a nanowire–InGaN-based LED emitting blue and yellow light. Moreover, the current-voltage characteristic of the nanowire LEDs could be improved using Al2O3:Mn4+,Mg2+ nanophosphors which is attributed to the increased heat dissipation in the nanowire LEDs. This study demonstrates a promising approach for improving the color reproducibility of WLEDs that can be suitable for practical applications that may include micro-displays, and AR/VR devices.
|Novelty and actuality and scientific meaningfulness of the results
Since the invention of high-brightness InGaN-blue light-emitting diode (LEDs), most WLEDs have been fabricated using a combination of blue-LED chips and yellow-emitting phosphors. Interest to develop high quantum yield (QY) nanostructure emitters is considerable to extend light-emitting diodes (LED) usage to other types of applications, such as wearable displays, curved or flexible television screens, biomedical devices and future lighting sources. Display technology using LEDs in size of 10-300 µm2 (mini/microLED display) with high CRI, ultra-wide viewing angle, fast response time, high brightness and impressive luminous efficiency, will be the next-generation display of LCD and OLED screens.
|Products of the project
- Scientific papers in referred journals (list):
|Images of project