Abstract
We report on the room temperature electrical and optical characterization of a multichip light-emitting diode (LED) lamp with peak emission at 281 nm. Four pairs of micro-pixel LED arrays were connected in series to fabricate the lamp, which delivered a pulsed output power of 235 mW at 1.18 A (duty cycle ∼0.5%), and attained a high external quantum efficiency of 4.63%. Under dc operation, the maximum power achieved by this lamp was ∼20 mW at a drive current of 220 mA. The peak output power improved 1.62-fold after a thermoelectric cooler was added to the device packaging assembly.