Investigations of silicon nano-crystal floating gate memories
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000
We have developed a novel strategy for the synthesis of emitters, based on amorphous poly-2,7-fluorene (2,7-PF) networks which exhibit high glass transition temperatures and good photoluminescence properties and are suitable for incorporation into multilayer lightemitting diodes (LEDs). The materials design includes nickel(0)-mediated copolymerization of 2,7-dibromo-9,9-dihexylfluorene with a tetrafunctional spiro-compound, 2,2′,7,7′-tetra-bromo-9,9-spirobifluorene, and 4-bromostyrene as end-capping reagent. The introduction of the spiro-bifluorene leads to a 90° branch of the growing 2,7-PF chain, the number of which can be controlled via the feed ratio of monomers used. The termination of the growing network with 4-phenylethenyl end groups limits the molecular weight, hence keeps the material soluble and processable. The oligomer solution can be cast into thin films and thermally cross-linked leading to new amorphous 2,7-PF networks. The amorphous 2,7-PF networks were incorporated in bilayer and trilayer LED devices which emitted colorfast blue light.
Arvind Kumar, Jeffrey J. Welser, et al.
MRS Spring 2000
Lawrence Suchow, Norman R. Stemple
JES
Kafai Lai, Alan E. Rosenbluth, et al.
SPIE Advanced Lithography 2007
Surendra B. Anantharaman, Joachim Kohlbrecher, et al.
MRS Fall Meeting 2020