
Quantum-dot LEDs (QDLEDs) could potentially lead to brighter, cheaper displays with a wider range of colours. Standard LCD monitors can generate no more than 500 cd/m
2 of light energy, while QDLEDs are less energy-efficient but cna generate as much as 9000 cd/m
2. The colour of QDLED depends on its size, making it relatively easy to make QDLEDs of different colours (such as the Red, Yellow and Green of a typical display), and they are relatively easy to produce. Current research is focused on two limitations: they have a relatively short operating life (about 300 hours), and use cadmium which is highly toxic.