Li, Jing published the artcileA Significantly Twisted Spirocyclic Phosphine Oxide as a Universal Host for High-Efficiency Full-Color Thermally Activated Delayed Fluorescence Diodes, COA of Formula: C25H16O, the publication is Advanced Materials (Weinheim, Germany) (2016), 28(16), 3122-3130, database is CAplus and MEDLINE.
A novel spirocyclic phosphine oxide host 4′-diphenylphosphinoylspiro[fluorene-9,9′-xanthene] (SFXSPO) was constructed, from a short-axis linkage strategy. The amplified steric bulk of its Ph2PO at the ortho-position effectively distorts the spiro[fluorene-9,9′-xanthene] (SFX) core, giving rise to the nonplanar xanthene and oblique fluorene. The extremely twisted, rigid, and asym. conformation of SFXSPO renders the highly disordered, mol. packing in its solid states, effectively mitigating intermol. interactions and facilitating uniform dispersion of the thermally-activated delayed fluorescence (TADF) dyes in its amorphous films. With the superiority in effectively suppressing the quenching effects induced by structural relaxation and dopant-dopant and host-dopant interactions, SFXSPO provided state-of the-art performance to its full-color devices, e.g., the record ηext of 22.5% and 19.1% and ηint of 100% for its yellow TADF diodes and single-host full-TADF complementary nearly white devices, resp., manifesting SFXSPO as the best universal TADF host reported so far. The efficiency stability of its blue and nearly white TADF diodes, as well as spectral stability of its white organic LEDs, can be further improved when more efficient and stable blue TADF dyes are available, which leaves the space for further device optimization.
Advanced Materials (Weinheim, Germany) published new progress about 159-62-6. 159-62-6 belongs to naphthyridine, auxiliary class Other Aromatic Heterocyclic,Spiro, name is Spiro[fluorene-9,9′-xanthene], and the molecular formula is C25H16O, COA of Formula: C25H16O.
Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem