Universal Display Corporation

Beatriz Eguillor Armendariz

Chuanjun Xia

Jui-Yi Tsai

Roberto Gomez Alabau

Montserrat Olivan Esco

Miguel A Esteruelas Rodrigo

Enrique Onate Rodriguez

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.

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Saragossa, Spain

Beatriz Eguillor Armendariz