Dr. Jim Murphy

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

Walk into your local electronics store and the red color emitting from many of the displays will be GE phosphor technology. 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 phosphor provides a cost effective, reliable on-chip LED solution for wide color gamut displays that is RoHS compliant. This presentation will discuss the technology and licensing strategy that have 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 as well as a new high-nit red phosphor 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).

[2] A. A. Setlur, R. J. Lyons, J. E. Murphy, N. Prashanth Kumar, M. Satya Kishore, ECS Journal of Solid State Science and Technology, 2 (2) R3059-R3070 (2013).

[3] F. Garcia-Santamaria, J.E. Murphy, A.A. Setlur, S.P. Sista, ECS Journal of Solid State Science and Technology, 7 (1) R3030-R3033 (2018)

[4] Murphy et al. SID Symposium Digest of Technical Papers, 11(1), vol. 52 (2021)

Jim Murphy is a principal scientist at GE Global Research Center where he serves as the LED Phosphor Program Manager which is currently focused on next generation display technologies. 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 studying under Art Nozik. 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.