The future generation of modern illumination should not only be cheap and highly efficient, but also demonstrate high quality of light, light which allows better color differentiation and fidelity. Here we are presenting a novel approach to create a white solid-state light source providing ultimate color rendition necessary for a number of applications. The proposed semi-hybrid device combines a monolithic blue-cyan light emitting diode (MBC LED) with a green-red phosphor mixture. It has shown a superior color rendering index (CRI), 98.6, at correlated color temperature of around 3400 K. The MBC LED epi-structure did not suffer from the efficiency reduction typical for monolithic multi-color emitters and was implemented in the two most popular chip designs: “epi-up” and “flip-chip”. Redistribution of the blue and cyan band amplitudes in the white-light emission spectrum, using the operating current, is found to be an effective tool for fine tuning the color characteristics. (Figure presented.).
Bibliographical noteThis is the peer reviewed version of the following article: Titkov, I. E., Yadav, A., Karpov, S. Y., Sakharov, A. V., Tsatsulnikov, A. F., Slight, T. J., ... Rafailov, E. U. (2016). Superior color rendering with a phosphor-converted blue-cyan monolithic light-emitting diode. Laser and Photonics Reviews, 10(6), 1031-1038, which has been published in final form at http://dx.doi.org/10.1002/lpor.201600196. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
- blue-cyan monolithic LED
- novel semi-hybrid approach
- superior CRI
- two phosphor mix