Stable Green Electroluminescence from an Iridium Tris-Heteroleptic Ionic Complex
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- 作者：Daniel Tordera ; Manuel Delgado ; Enrique Ort铆 ; Henk J. Bolink ; Julien Frey ; Md. Khaja Nazeeruddin ; Etienne Baranoff
- 刊名：Chemistry of Materials
- 出版年：2012
- 出版时间：May 22, 2012
- 年：2012
- 卷：24
- 期：10
- 页码：1896-1903
- 全文大小：353K
- 年卷期：v.24,no.10(May 22, 2012)
- ISSN：1520-5002
文摘
An ionic tris-heteroleptic iridium complex gives green light-emitting electrochemical cells (LECs) with unprecedented performances for this part of the visible spectrum. The devices are very bright (>1000 cd m鈥?), efficient (3%), and stable (>55 h). The novel complex is prepared using a new and efficient synthetic procedure. We show that there is a mixed orbital formation originating from the two different orthometalating ligands resulting in photophysical properties that lie between those of its two bis-heteroleptic analogs. Therefore, tris-heteroleptic complexes provide new avenues for fine-tunning the emission properties and to bridge gaps between a series of bis-heteroleptic complexes.