Highly Photoluminescent Blue Ionic Platinum-Based Emitters

Sicilia, Violeta (Universidad de Zaragoza) ; Arnal, Lorenzo (Universidad de Zaragoza) ; Chueca, Andrés J. ; Fuertes, Sara ; Babaei, Azin ; Igual Muñoz, Ana María ; Sessolo, Michele ; Bolink, Henk J.

Resumen: New cycloplatinated N-heterocyclic carbene (NHC) compounds with chelate diphosphines (P<^>P) as ancillary ligands: [Pt(R-C<^>C*)(P<^>P)]PF6 (R= H, P<^>P = dppm (1A), dppe (2A), dppbz (3A); R = CN, P<^>P = dppm (1B), dppe (2B), dppbz (3B)) have been prepared from the corresponding starting material [{Pt(R-C<^>C*)(mu-Cl)}(2)] (R = H, A, R = CN, B) and fully characterized. The new compound A has been prepared by a stepwise protocol. The photophysical properties of 1A-3A and 1B-3B have been widely studied and supported by the time-dependent-density functional theory. These compounds show an efficient blue (dppe, dppbz) or cyan (dppm) emission in PMMA films (5 wt %), with photoluminescence quantum yield (PLQY) ranging from 30% to 87% under an argon atmosphere. This emission has been assigned mainly to transitions from (ILCT)-I-3 [pi(NHC) -> pi*(NHC)] excited states with some (ILCT)-I-3 [pi(NHC) -> pi*(PAP)] character. The electroluminescence of these materials in proof-of-concept solution-processed organic light-emitting diodes containing 3A and 3B as dopants was investigated. The CIE coordinates for devices based on 3A (0.22, 0.41) and 3B (0.24, 0.44) fit within the sky blue region.

Idioma: Inglés

DOI: 10.1021/acs.inorgchem.9b02782

Año: 2020

Publicado en: Inorganic Chemistry 59, 2 (2020), 1145-1152
ISSN: 0020-1669

Factor impacto JCR: 5.165 (2020)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 5 / 45 = 0.111 (2020) - Q1 - T1

Factor impacto SCIMAGO: 1.348 - Chemistry (miscellaneous) (Q1) - Physical and Theoretical Chemistry (Q1) - Inorganic Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FSE/E17-17R
Financiación: info:eu-repo/grantAgreement/ES/MICIU-FEDER/PGC2018-094749-B-I00

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)