Superior color rendering with a phosphor-converted blue-cyan monolithic light-emitting diode

Ilya E. Titkov, Amit Yadav*, Sergey Yu. Karpov, Alexei V. Sakharov, Andrey F. Tsatsulnikov, Thomas J. Slight, Andrei Gorodetsky, Edik U. Rafailov

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

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.).

Original languageEnglish
Pages (from-to)1031-1038
Number of pages8
JournalLaser and Photonics Reviews
Volume10
Issue number6
DOIs
Publication statusPublished - 22 Nov 2016

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Phosphors
phosphors
Light emitting diodes
light emitting diodes
Color
color
chips
Light emission
light emission
Light sources
light sources
emitters
emission spectra
Tuning
Lighting
illumination
tuning
solid state
Temperature
temperature

Bibliographical note

This 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.

Keywords

  • blue-cyan monolithic LED
  • novel semi-hybrid approach
  • superior CRI
  • two phosphor mix

Cite this

Titkov, Ilya E. ; Yadav, Amit ; Karpov, Sergey Yu. ; Sakharov, Alexei V. ; Tsatsulnikov, Andrey F. ; Slight, Thomas J. ; Gorodetsky, Andrei ; Rafailov, Edik U. / Superior color rendering with a phosphor-converted blue-cyan monolithic light-emitting diode. In: Laser and Photonics Reviews. 2016 ; Vol. 10, No. 6. pp. 1031-1038.
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Titkov, IE, Yadav, A, Karpov, SY, Sakharov, AV, Tsatsulnikov, AF, Slight, TJ, Gorodetsky, A & Rafailov, EU 2016, 'Superior color rendering with a phosphor-converted blue-cyan monolithic light-emitting diode', Laser and Photonics Reviews, vol. 10, no. 6, pp. 1031-1038. https://doi.org/10.1002/lpor.201600196

Superior color rendering with a phosphor-converted blue-cyan monolithic light-emitting diode. / Titkov, Ilya E.; Yadav, Amit; Karpov, Sergey Yu.; Sakharov, Alexei V.; Tsatsulnikov, Andrey F.; Slight, Thomas J.; Gorodetsky, Andrei; Rafailov, Edik U.

In: Laser and Photonics Reviews, Vol. 10, No. 6, 22.11.2016, p. 1031-1038.

Research output: Contribution to journalArticle

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AU - Tsatsulnikov, Andrey F.

AU - Slight, Thomas J.

AU - Gorodetsky, Andrei

AU - Rafailov, Edik U.

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N2 - 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.).

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KW - two phosphor mix

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