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首页> 外文期刊>Chemistry: A European journal >Bluish-green BMes _2-functionalized Pt ~II complexes for high efficiency PhOLEDs: Impact of the BMes _2 location on emission color
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Bluish-green BMes _2-functionalized Pt ~II complexes for high efficiency PhOLEDs: Impact of the BMes _2 location on emission color

机译：用于高效PhOLED的蓝绿色BMes _2-官能化的Pt〜II配合物：BMes _2位置对发射颜色的影响

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摘要

New phosphorescent Pt ~(II) compounds based on dimesitylboron (BMes _2)-functionalized 2-phenylpyridyl (ppy) N,C-chelate ligands and an acetylacetonato ancillary ligand have been achieved. We have found that BMes _2 substitution at the 4'-position of the phenyl ring can blue-shift the phosphorescent emission energy of the Pt ~(II) compound by approximately 50 nm, compared to the 5'-BMes _2 substituted analogue, without substantial loss of luminescent quantum efficiencies. The emission color of the 4'-BMes _2 substituted Pt ~(II) compound, Pt(Bppy)(acac) (1) can be further tuned by the introduction of a substituent group at the 3'-position of the phenyl ring. A methyl substituent red-shifts the emission energy of 1 by approximately 10 nm whereas a fluoro substituent blue-shifts the emission energy by about 6 nm. Using this strategy, three bright blue-green phosphorescent Pt ~(II) compounds 1, 2 and 3 with emission energy at 481, 492, and 475 nm and φ _(PL)=0.43, 0.26 and 0.25, respectively, have been achieved. In addition, we have examined the impact of BMes _2 substitution on 3,5-dipyridylbenzene (dpb) N,C,N-chelate Pt ~(II) compounds by synthesizing compound 4, Pt(Bdpb)Cl, which has a BMes 2 group at the 4'-position of the benzene ring. Compound 4 has a phosphorescent emission band at 485 nm and φ ~(PL)=0.70. Highly efficient blue-green electroluminescent (EL) devices with a double-layer structure and compounds 1, 3 or 4 as the phosphorescent dopant have been fabricated. At 100 cd m ~(-2) luminance, EL devices based on 1, 3 and 4 with an external quantum efficiency of 4.7, 6.5 and 13.4 %, respectively, have been achieved. Easily PhOLED: Blue-green phosphorescent organic light-emitting diodes (PhOLEDs) based on BMes _2-functionalized N,C-chelate and N,C,N-chelate Pt ~(II) compounds with external quantum efficiencies of 5 to 22 % have been achieved (see figure). BMes _2 substitution and its location on the N,C- or N,C,N-chelate ligand have been found to be critical in achieving efficient blue-green phosphorescent Pt ~(II) compounds.
机译：基于二甲磺隆（BMes _2）-官能化的2-苯基吡啶基（ppy）N，C-螯合物和乙酰丙酮基辅助配体，已经获得了新的磷光Pt〜（II）化合物。我们已经发现，与5'-BMes _2取代的类似物相比，在苯环的4'-位置处的BMes _2取代可以使Pt〜（II）化合物的磷光发射能发生蓝移约50 nm。发光量子效率的实质损失。 4'-BMes _2取代的Pt〜（II）化合物Pt（Bppy）（acac）（1）的发光颜色可以通过在苯环的3'-位置引入取代基来进一步调节。甲基取代基使1的发射能红移约10 nm，而氟取代基使1的发射能红移约6 nm。使用这种策略，已经获得了三种明亮的蓝绿色磷光Pt〜（II）化合物1、2和3，其发射能量分别为481、492和475 nm，并且φ_（PL）= 0.43、0.26和0.25。 。此外，我们已经通过合成具有BMes 2的化合物4 Pt（Bdpb）Cl来研究BMes _2取代对3,5-二吡啶基苯（dpb）N，C，N-螯合物Pt〜（II）化合物的影响。基团在苯环的4'-位。化合物4具有在485nm处的磷光发射带，并且φ〜（PL）＝ 0.70。已经制造出具有双层结构和化合物1、3或4作为磷光掺杂剂的高效蓝绿色电致发光（EL）器件。在亮度为100 cd m〜（-2）的情况下，已经实现了基于1、3和4的EL器件，其外部量子效率分别为4.7％，6.5％和13.4％。易于PhOLED：基于BMes _2官能化的N，C-螯合物和N，C，N-螯合物Pt〜（II）化合物的蓝绿色磷光有机发光二极管（PhOLED）具有5-22％的外部量子效率已实现（见图）。已发现BMes _2取代及其在N，C-或N，C，N-螯合物上的位置对于实现有效的蓝绿色磷光Pt〜（II）化合物至关重要。

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