English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Open

Presents the pdf analysis as premium feature

PDF Analysis

Insights

Presents the summarisation as premium feature

Summarisation

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Potential dianionic chelates, 5,5′-bis(trifluoromethyl)-2H,2′H-3,3′-bipyrazole (bipzH2) and 5,5′-(1-methylethylidene)-bis(3-trifluoromethyl-1H-pyrazole) (mepzH2), were synthesized from Claisen condensation employing ethyl trifluoroacetate with 2,3-butanedione and with 3,3-dimethyl-2,4-pentanedione, followed by hydrazine cyclization. These chelates were then utilized in the preparation of four emissive Pt(II) metal complexes [Pt(tbbpy)(bipz)] (1), [Pt(msbpy)(bipz)] (2), [Pt(tbbpy)(mepz)] (3) and [Pt(msbpy)(mepz)] (4), where tbbpy and msbpy represent 4,4′-di-t-butyl-2,2′-bipyridine and 4,4′-dimesityl-2,2′-bipyridine, respectively. Single crystal X-ray structural analyses of 2 and 3 were executed to unveil the basic coordination geometry around the Pt(II) center as well as the π–π stacking interaction in the solid state. These complexes are essentially non-emissive in solution (Q. Y. = 0.2–0.4%), but are highly luminescent in the solid state with QY of 52% and 83% and τobs of 368 ns and 8.37 μs for 1 and 3, respectively. Their photophysical properties were measured and discussed on the basis of computational approaches. For applications, non-doped organic light emitting diodes (OLEDs) were fabricated using 1 and 3 as emitters, exhibiting red-orange emission with a maximum luminance of 43 000 cd m−2, an EQE of 19.0%, a CE of 21.0 cd A−1 and a PE of 15.5 lm W−1, and yellow emission with a maximum luminance of 5100 cd m−2, an EQE of 7.1%, a CE of 21.0 cd A−1 and a PE of 11.3 lm W−1, respectively. The particularly higher OLED efficiencies of 1versus3 highlight the design principle of Pt(II) based phosphors, particularly for the fabrication of a non-doped OLED architecture.

journal of materials chemistry c

Efficient Pt(<scp>ii</scp>) emitters assembled from neutral bipyridine and dianionic bipyrazolate: designs, photophysical characterization and the fabrication of non-doped OLEDs

Efficient Pt(ii) emitters assembled from neutral bipyridine and dianionic bipyrazolate: designs, photophysical characterization and the fabrication of non-doped OLEDs