Labile or Stable: Can Homoleptic and Heteroleptic PyrPHOS鈥揅opper Complexes Be Processed from Solution?

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• 作者：Daniel Volz ; Manuela Wallesch ; Stephan L. Grage ; J枚rg G枚ttlicher ; Ralph Steininger ; David Batchelor ; Tonya Vitova ; Anne S. Ulrich ; Clemens Heske ; Lothar Weinhardt ; Thomas Baumann ; Stefan Br盲se
• 刊名：Inorganic Chemistry
• 出版年：2014
• 出版时间：August 4, 2014
• 年：2014
• 卷：53
• 期：15
• 页码：7837-7847
• 全文大小：496K
• ISSN：1520-510X

文摘

Luminescent Cu(I) complexes are interesting candidates as dopants in organic light-emitting diodes (OLEDs). However, open questions remain regarding the stability of such complexes in solution and therefore their suitability for solution processing. Since the emission behavior of Cu(I) emitters often drastically differs between bulk and thin film samples, it cannot be excluded that changes such as partial decomposition or formation of alternative emitting compounds upon processing are responsible. In this study, we present three particularly interesting candidates of the recently established copper鈥揾alide鈥?diphenylphosphino)pyridine derivatives (PyrPHOS) family that do not show such changes. We compare single crystals, amorphous bulk samples, and neat thin films in order to verify whether the material remains stable upon processing. Solid-state nuclear magnetic resonance (MAS ³¹P NMR) was used to investigate the electronic environment of the phosphorus atoms, and X-ray absorption spectroscopy at the Cu K edge provides insight into the local electronic and geometrical environment of the copper(I) metal centers of the samples. Our results suggest that鈥攗nlike other copper(I) complexes鈥攖he copper鈥揾alide鈥揚yrPHOS clusters are significantly more stable upon processing and retain their initial structure upon quick precipitation as well as thin film processing.