What is RadiantRed™ Technology?
Setting the Stage - Rec. 2020
The ITU-R Recommendation BT, 2020 or Rec. 2020 has been put forth to standardize various metrics required for ultra high definition TVs/ Displays. To meet these requirements, Rec. 2020 calls for a red narrow line emitter centered at a wavelength of 630nm.
Typically, red emission that is lower in wavelength (higher in energy) than 630nm will increase the brightness of the display but have a lower color gamut. Alternatively, red emission that is higher in wavelength (lower in energy) than 630nm will result in an increase in color gamut, but will carry a penalty of reduced brightness.
As seen in this spectral comparison, the narrow red emission peak of RadiantRed™ Technology enables deep red gamut with minimal energy loss compared with industry standard red phosphor.
GE’s Solution - RadiantRed
Applying years of expertise in materials development and optimization, GE identified the RadiantRed KSF/PFS phosphor composition and developed processing methods to make it compatible with traditional LED-LCDs. The strong red emission from RadiantRed results from embedding a small quantity of Mn4+ ions into a transparent host lattice of potassium fluorosilicate (KSF/PFS), K2SiF6. This KSF/PFS host lattice alters the Mn4+ electronic energy levels resulting in strong absorption of blue light and narrow-line red luminescence centered at 631nm. RadiantRed is the only available on chip, RoHS compliant phosphor solution that can optimize the requirements for bright, wide gamut displays.
How is RadiantRed Technology Standing Out?
As a comparison, RadiantRed shows more than three times the relative emission between 620-640nm than a typical broad band emitting Eu2+ doped nitride phosphor which results in displays delivering wide color gamut without sacrificing brightness. As opposed to OLED or quantum dot containing displays, RadiantRed displays do not require use of remote films and/or encapsulants to achieve reliability requirements.
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