Dr. James E. Murphy

LED Phosphor Program Manager, Senior Research Scientist | GE Global Research
Dr. James E. Murphy

Market Leading Wide Color Gamut, Narrow-Band Phosphors by GE & Path Towards Enabling Next Generation Displays

Since first being introduced into the display industry in 2014, the red-line emission of K2SiF6:Mn4+ phosphor (PFS/KSF) centered at 631 nm has become the market leading wide color gamut solution for 4K UHD TVs, tablets, phones, monitors and laptops. KSF provides a cost effective, on-chip LED solution for wide color gamut displays that is RoHS compliant. As opposed to OLED or quantum dot containing displays, KSF-based LEDs are a drop-in replacement in LCD BLUs and do not require additional remote films and/or barrier encapsulants to achieve excellent reliability. This presentation will discuss the technology that has enabled this success and the path forward around integration into future displays with higher color gamut (>90% BT.2020) and additional functionality (minileds, remote films, microleds) versus current HDR 4K/8K displays. Although the narrow-band emission of KSF enables improved brightness and wider color gamut relative to InP QDs, a more narrow-band emitting green phosphor continues to be a need in the display industry. An update on GE’s efforts around narrow-band green phosphor development will also be presented.

References:

[1] James E. Murphy, Florencio Garcia-Santamaria, Anant A. Setlur, Srinivas Sista, SID Symposium Digest of Technical Papers, 46 (1), p. 927-930 (2015).

Biography

Jim Murphy is a senior scientist at GE Global Research Center where he serves as the LED Phosphor Program Manager. He has over 60 global patent applications and publications in the field of inorganic luminescent material development. He received his Ph.D. in Physical Chemistry from the University of Colorado where he developed semiconductor nanocrystals for solar cell applications. After serving as a postdoctoral researcher at the National Renewable Energy Laboratory, he spent 2006-2009 as a Principal Research Scientist with OSRAM SYLVANIA Inc. working on phosphor development and scale up at the Towanda, PA facility as it transitioned to become Global Tungsten and Powders Corp. Jim graduated in 1996 with a B.A. in Chemistry from Franklin and Marshall College.