In 1963, as a University of Minnesota freshman, I purchased my first Red and White females. During high school, I spent my summers working with show cattle at Mor-Ayr Farm owned by Dr. R. B.Graves, a physician at Red Wing, MN. He purchased and bred some of North America’s fines...
7,8. Currently, several promising red-emitting phosphors have been proven to effectively enhance the color rendition, including (Ca, Sr, Ba)2Si5N8:Eu2+(ref.9, Sr, Ca)AlSiN3:Eu2+(refs10,11), SrLiAl3N4:Eu2+(ref.12) and K2(Si, Ti)F6:Mn4+(refs8,13)....
therefore attributed to (i) an enlarged Ca(Eu)N5 polyhedron that actually decreases the crystal field strength, (ii) an expanded band gap that lifts up the lowest position of the Eu2+ 5d state and (iii) an enhanced EuI emission intensity that increases the left wing of the emission band....