IRIDIUM (III) BASED PHOSPHORS BEARING PINCER CARBENE AND PYRAZOLYL CHELATES
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United States of America Patent
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Issued Date -
Dec 8, 2016
app pub date -
Jul 23, 2015
filing date -
Jun 5, 2015
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Abandoned
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Abstract
The present invention provides a class of iridium (III) based phosphors bearing both pincer carbene and pyrazolyl chelates. Differing from the conventional cyclometalated Ir(III) metal complexes, these novel phosphorescent Ir(III) metal complexes are synthesized from a class of pincer carbene chelate, a class of pyrazolyl-based chelate and an iridium metal source complex. Because the phosphorescent Ir(III) metal complex proposed by the present invention includes multiple strong bonding interactions (Ir—C bond), the non-radiative decay from the higher lying triplet excited state can be effectively suppressed. Thus, this novel phosphorescent Ir(III) metal complex is able to emit a range of visible light (particularly the blue light) with high color purity and high efficiency as neat sample. Moreover, this novel phosphorescent Ir(III) metal complex is also adapted as the guest emitter in the light emitting layer (EML) for the traditional doped OLED architecture.
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