Solid-state lighting (SSL) has counted for 20% of overall energy consumption on the earth. The designed SSL system set by the Department of Energy (DOE) has been targeted to save electricity on the earth by 6.9 trillion kWh before 2035, which saved around 2.1 billion metric tons for the emission of CO₂. Although the modern lighting industry has developed fundamental progress based on solid-state electronics and Ni⁺-based phosphor, LED lighting is still pursuing better efficiency, color performance, and longer lifetime. Current light-emitting diode-based SSL suffers from serval fundamental issues, especially for green (520nnm) and red color (630nm) due to the indium content, where there is much space for progress, and many opportunities are out there for realizing its full potential.

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Solid-state lighting (SSL) has counted for 20% of overall energy consumption on the earth. The designed SSL system set by the Department of Energy (DOE) has been targeted to save electricity on the earth by 6.9 trillion kWh before 2035, which saved around 2.1 billion metric tons for the emission of CO₂. Although the modern lighting industry has developed fundamental progress based on solid-state electronics and Ni⁺-based phosphor, LED lighting is still pursuing better efficiency, color performance, and longer lifetime. Current light-emitting diode-based SSL suffers from serval fundamental issues, especially for green (520nnm) and red color (630nm) due to the indium content, where there is much space for progress, and many opportunities are out there for realizing its full potential.

This thesis aims at solving the fundamental problems in LED and Liquid Crystal Displays (LCDs); we proposed the polarized quantum rods (QRs) down converter for modern solid-state lighting applications to overcome current limitations such as reabsorption and large Förster resonance energy transfer, improving solid-state QY up to 81%. Optimize various strategies for spectrum, color rendering index, and efficiency optimization. Display on-chip LED achieved 149lm/W with 118% NTSC color performance. Optimized inkjet printing ink solution enables the application in micropatterning of the mini-LED display. Lighting product consists of narrow-band emitters CdSe/Cd_xZn_1-xS/ZnS that can tune R1-R9 value independently with minimum efficacy sacrifice and finally achieve Ra=95 with R9 up to 98.

Finally, we explore the basic mechanism of the degradation process of down-conversion materials and continue to work on improving the long-term stability of SSL devices. These works pave the way for the commercial application of quantum materials for harsh conditions for energy-efficient modern displays and powerful SSL devices.