Saga University in Japan has reported work towards white light-emitting diodes (WLEDs) based on rare-earth (RE)-doped gallium oxide (Ga2O3) [Yafei Huang et al, Appl. Phys. Lett., v119, p062107, 2021].   The researchers adopted a vertical integration strategy with Ga2O3 layers doped with thulium (Tm), europium (Eu) and erbium (Er) grown on top of each other. The team comments that “films grown by lateral integration are deposited side-by-side, while the co-doping of multiple rare earth elements into the same host will unavoidably degrade the crystal ...

Rare-earth metals, which are needed for dyes and phosphor converters in light emitting diodes, are a finite resource. Osram Opto Semiconductors, as one of four partners in the “ORCA” project, is therefore researching and developing new types of organic dyes and inorganic phosphor converters. The aim of this project, which began on May, 2016, is to reduce the volume of these materials by developing new solutions, and to encourage the implementation of these solutions in actual production.

New “TEN°” binning from Osram Opto Semiconductors provides the basis for unprecedented color consistency for white LEDs which are used for example as single-LED light sources in spotlights and downlights. To achieve this the current standard CIE 1931 2° xy color space has been supplemented with CIE 2015 10° u‘v‘, recently developed by the International Commission on Illumination and implemented by Osram Opto Semiconductors as 10° binning. In the third generation of the Soleriq S 13, “TEN°“ will be available on the market as an additional feature from March 2016.

Tridonic Jennersdorf GmbH, a subsidiary of Tridonic GmbH & Co KG, Dornbirn and therefore part of the Zumtobel Group, has signed a licence agreement with Medion AG, Germany covering the use of silicate-based white LEDs.

Toshiba Corporation announced the launch of white LEDs fabricated with gallium nitride-on-silicon (GaN-on-Si) process. The LEDs are low power sub-watt type and ideal for indoor lighting applications, due to reduction of forward voltage (VF). Two package line-ups, the TL2FK series with 3.0 × 1.4mm package and the TL3GA series with 3.0 × 3.0mm package, will be made available. It is believed that the Sub-Watt Type White LEDs will be widely used as light sources for general lighting applications Straight tubes, light bulbs, main lighting, ceiling li...