Our main technology delivers new narrow-band red emitters, which have the promise to deliver significantly increased light output for warm white LEDs, while ensuring high color quality light. Currently, we are focusing our work around blue-excitable Eu3+ as line-emitter for warm white LEDs. Eu3+ is known for its excellent emission properties for white light, but its weak absorption in the blue prevents these ions to be used for LEDs. Our fundamentally new concept of inter-particle energy transfer at the nanoscale solves this, by using separate (nano)materials for absorption and emission events. Seaborough has demonstrated the feasibility of this technology with various different materials and is currently working on delivering warm white LED demonstration devices.