Pico Projectors are a demanding application requiring lots of light at minimum energy due to the battery dependent mobile nature of the device. OSRAM Opto Semiconductors’ new generation of UX:3 high power chips when combined with an LED have achieved 150 lux which is 50% brighter than its predecessor. It was achieved by improving the efficiency of extracting the light (photons) produced by the chip – an improved outcoupling efficiency.

To achieve its success, OSRAM has improved on the implementation of the metallic n-contact grid which injects the current on the chip surface by burying the entire grid inside the chip under the p-contact. The buried n-contact yields higher quantum efficiencies (ratio between emitted photons versus injected electrons) in the new chips.

A 50% brightness improvement promises a significant improvement in performance for pico projectors adopting the technology.

Source

Bringing LED Efficiency to New Heights OSRAMS UX3 Chip Technology