LED closes the yellow gap: Full conversion of blue into amber light by new nitride phosphor
Thursday, July 23, 2009 - 07:35
in Physics & Chemistry
(PhysOrg.com) -- Monochromatic light-emitting diodes cover a large part of the visible spectrum with high effi-ciency. For blue light, nitride diodes achieve external quantum efficiencies in excess of 65%, i. e., one photon is emitted for approx. 2/3 of the electron-hole pairs injected into the diode. For red light, phosphor diodes achieve efficiencies of approx. 50%. However, so far no highly efficient monochromatic LEDs have been available for the `yellow gap` at around 560 nm. Now researchers with Philips Lumileds have developed a monochromatic nitride diode that closes this gap.