Pyrazolate-Bridged NHC Cyclometalated [Pt2] Complexes and [Pt2Ag(PPh3]+ Clusters in Electroluminescent Devices

Roy, Jorge (Universidad de Zaragoza) ; Forzatti, Michele ; Arnal, Lorenzo ; Martín, Antonio ; Fuertes, Sara ; Tordera, Daniel ; Sicilia, Violeta (Universidad de Zaragoza)

Resumen: he ionic transition metal complexes (iTMCs) [{Pt(C∧C*)(μ-Rpz)}2Ag(PPh3)]X (HC∧C* = 1-(4-(ethoxycarbonyl)phenyl)-3-methyl-1H-imidazole-2-ylidene, X = ClO4/PF6; Rpz = pz 1a/2a, 4-Mepz 1b/2b, and 3,5-dppz 1c/2c) were prepared from the neutral [{Pt(C∧C*)(μ-Rpz)}2] (Rpz = pz A, 4-Mepz B, and 3,5-dppz C) and fully characterized. The “Ag(PPh3)” fragment is in between the two square-planar platinum units in an “open book” disposition and bonded through two Pt–Ag donor–acceptor bonds, as shown by X-ray diffraction (dPt–Ag ∼ 2.78 Å, 1a–1c). 195Pt{1H} and 31P{1H} NMR confirmed that these solid-state structures remain in solution. Photoluminescence studies and theoretical calculations on 1a, were performed. The diphenylpyrazolate derivatives show the highest photoluminescence quantum yield (PLQY) in the solid state. Therefore, 2c and its neutral precursor C were selected as active materials on light-emitting devices. OLEDs fabricated with C showed a turn-on voltage of 3.2 V, a luminance peak of 21,357 cd m–2 at 13 V, and a peak current efficiency of 28.8 cd A–1 (9.5% EQE). They showed a lifetime t50 of 15.7 h. OLEDs using 2c showed a maximum luminance of 114 cd m–2, while LECs exhibited a maximum luminance of 20 cd m–2 and a current efficiency of around 0.2 cd A–1, with a t50 value of 50 min.

Idioma: Inglés

DOI: 10.1021/acs.inorgchem.4c00105

Año: 2024

Publicado en: Inorganic Chemistry 63, 16 (2024), 7275-7285
ISSN: 0020-1669

Factor impacto JCR: 4.7 (2024)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 6 / 43 = 0.14 (2024) - Q1 - T1

Factor impacto CITESCORE: 7.4 - Inorganic Chemistry (Q1) - Physical and Theoretical Chemistry (Q1)

Factor impacto SCIMAGO: 0.958 - Chemistry (miscellaneous) (Q1) - Physical and Theoretical Chemistry (Q1) - Inorganic Chemistry (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E17-23R
Financiación: info:eu-repo/grantAgreement/EC/HORIZON EUROPE/101073045 /EU/- addressing the challenges of high-performance solut
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2021-122869NB-I00

Tipo y forma: Artículo (Versión definitiva)

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