Patent ID: 6160267
Filing Date: 2000-12-12
Classification: H01L,Y02E

Abstract:
The molecular light emitting diode that changes colors as a function of analyte vapors comprising:(a) a first electrode;(b) a hole transport layer formed on said first electrode, wherein said hole transport layer is selected from the group consisting of tetrakis(p-decylphenylisocyano)platinum tetranitroplatinate (II), oligomerized tris(p-thienylphenyl)-amino, poly(p-phenylene vinylene) polymers of symmetric and asymmetric triaryl amines, including 4,4'-bis(phenyl-m-tolylamino)biphenyl (TPD), oligothiophenes with diaryl amino substituents, including 2,5-bis{4-[bis(4-methylphenyl)amino]phenyl}thiophene, 5,5'-bis{4-[bis(4-methylphenyl)amino]phenyl}-2,2'-bithiophene, 5,5""-bis{4-[bis(4-methylphenyl)amino]phenyl}-2,2':5',2""-ter thiophene, and 5,5'""-bis{4-[bis(4-methylphenyl)amino]phenyl}-2,2':5',2"":5"",2'""-quarterthi ophene;(c) a sensing/emitting layer formed on said hole transport layer, said sensing/emitting layer consisting essentially of a single polymeric material that changes color from a first color to a second color upon exposure to said analyte vapors and is reversible back to said first color upon removal of said analyte vapors or upon exposure of said sensing/emitting layer to a different analyte;(d) an electron conductor layer formed on said sensing layer; and(e) a second electrode formed on said electron conductor layer, and wherein at least said first electrode comprises an optically transparent material, wherein said hole transport layer moves positive charge to said emitting/sensing layer, and wherein said electron conductor layer moves electrons from said second electrode to said sensing/emitting layer.