Quantum dots [crystalline semi-conductor materials]; quantum dot light-emitting diodes [QLED]; light emitting diodes (LEDs) semiconductors; semiconductor devices and apparatus; semiconductor chips; nanoparticle size analyzers; nanocrystals (nanometer-sized crystals) of semiconductors; ink-jet printers; solid ink cartridges [empty] for ink-jet printers; print heads for inkjet printers.