Owing to their versatility and tunability, microLEDs (μLEDs) with sizes less than 50 μm are considered integral components of next-generation display technology and are able to satisfy the demands of sophisticated devices, such as cellphones, smart watches, virtual reality, microprojectors, and ultra-high-definition TVs [1,2]. Over the past decade, the number of commercially available μLED displays has grown significantly, as manufacturers seek to capitalize on the success of this technology . μLEDs have the potential to surpass organic LEDs by providing displays with high contrast, a wide color gamut, high efficiency, and a wide viewing angle, which are additional to the prospect of translucent and versatile displays . Huang Chen et al. demonstrated a hybrid quantum dot–nanoring–μLED that exhibited a color gamut of approximately 104.8% of the National Television Standards Committee (NTSC) standard and 78.2% of Rec. 2020 [4,5]. Huang et al. achieved a record high external quantum efficiency (EQE) for green and blue QLEDs, and the devices exhibited a record 90% coverage of Rec. 2020, which exhibits lifetimes longer than 100,000 and 280,000 h for green and red QLEDs for ultra-high definition displays, respectively . Full-color displays can be achieved via mass transfer processes using RGB μLEDs. However, this approach has several drawbacks, such as low efficiency caused by the so-called “green-gap” originating from green μLEDs and nonradiative recombination at the surface for red μLEDs owing to the use of AlGaInP as the active region material . A further problem for red μLEDs is that the EQE decreases when the pixel size decreases . To address these problems, blue μLEDs can be integrated with color converters, such as yellow-emitting phosphors or nanocrystals (NCs) that emit red and green light, to achieve higher quality full-color displays . Lin et al. successfully fabricated high-luminance efficiency and a wide color gamut for an NC-based solid and hybrid-type WLED device, which exhibits a higher efficiency (51 lm/W), a wide color gamut (122% of NTSC and 91% of Rec. 2020), and an efficiency decay of approximately 12% during a 200 h reliability test . However, phosphors are not suitable for microdisplay technology because of their large particle size . In contrast, NCs offer several compelling features, including the quantum confinement effect (specifically for quantum dots), a narrow emission spectrum, high quantum yield, and low manufacturing costs, which makes them an attractive alternative for phosphors in full-color displays .