Universal Display Corporation

Roberto Gomez Alabau

Chuanjun Xia

Jui-Yi Tsai

Miguel A Esteruelas

Enrique Oñate

Montserrat Oliván

Montserrat Olivan Esco

Enrique Onate Rodriguez

Beatriz Eguillor Armendariz

Miguel A Esteruelas Rodrigo

A method of making an osmium(II) complex having Formula I, L-Os-L, wherein Land Lare independently a biscarbene tridentate ligand, wherein Land Lcan be same or different is disclosed. The method includes (a) reacting a precursor of ligand Lwith an osmium precursor to form an intermediate product, wherein the osmium precursor having the formula OsH(PR), wherein x is an integer from 2 to 6 and y is an integer from 2 to 5, and R is selected from the group consisting of aryl, alkyl and cycloalkyl; and (b) reacting a precursor of ligand Lwith said intermediate product.

Organic electroluminescent materials and devices

A compound having a structure of formula OsLLis described. In the structure of OsLL, Lis a tetradentate ligand coordinated to Os; Lis a bidentate ligand coordinated to Os; and Ladopts a non-square planar coordination geometry. Formulations and devices, such as an OLEDs, that include the compound of Formula OsLLare also described.

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Saragossa, Spain

Roberto Gomez Alabau