Patent ID: 7641815
Filing Date: 2010-01-05
Classification: C09K,C23C

Abstract:
1. A luminescent material having the formula: wherein A is cesium; B is tin; X, X′, and X″ are independently selected from at least one of iodine and bromine; the dopants are present in amounts less than 5 percent in terms of elemental composition and include electron acceptors and electron donors; a is 1; b is in the range of 1to 3; and x,x′, and x″ have a sum that is 1+2b; and wherein the luminescent material exhibits photoluminescence having: (a) a quantum efficiency of at least 20 percent; (b) a spectral width no greater than 100 nm at Full Width at Half Maximum; and (c) a peak emission wavelength in the near infrared range.