| abstract |
FIELD: lighting. n SUBSTANCE: invention relates to novel luminescent materials for light-emitting devices. Proposed formula material (Ba 1-x-y-z Sr x Ca y Eu z ) 2 Si 5-a-b Al a N 8-a-4b O a+4b , where 0.3≤x≤0.9, 0.01≤y≤0.04, 0.005≤z≤0.04, 0≤a≤0.2, 0≤b≤0.2 and an average particle size d 50 ≥6 mcm. Disclosed material emits red light, suitable for use in a wide range of applications. n EFFECT: pcLEDs, containing said luminescent material, give warm white light with optimised luminous efficacy and colour rendition. n 7 cl, 6 dwg, 2 tbl, 3 ex |