Journal Article quantum dot light-emitting diodes active-matrix display capacitive sensor continuously graded quantum dots golden tortoise beetle heat dissipation heavy-metal-free quantum dots high-luminance high-resolution patterning ligand crosslinking multiexciton suppression neuromorphic device photopatterning quantum dot light-emitting diode quantum dots resistive random-access memory single-walled carbon nanotubes sinter-free printable conductor stability thin-film transistors