Synthesis and properties of a series of iridium complexes with imidazolo[2,1-b]thiazole derivatives as primary ligands†,New Journal of Chemistry

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Synthesis and properties of a series of iridium complexes with imidazolo[2,1-b]thiazole derivatives as primary ligands†
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2019-03-14 00:00:00 , DOI: 10.1039/c8nj06295a
Xin-ying Yin _{1,

2,

3,

4} , Zhi-yu Yang _{4,

5,

6,

7} , Guo-li Huang _{1,

2,

3,

4} , Jian-jian Bian _{1,

2,

3,

4} , Deng-qiang Wang _{1,

2,

3,

4} , Qin Wang _{1,

2,

3,

4} , Ming-yu Teng _{1,

2,

3,

4} , Zheng-liang Wang _{4,

5,

6,

7} , Jie Zhang _{4,

8,

9,

10}

Affiliation

3-Methyl-6-phenylimidazo[2,1-b]thiazole (mpmt) and 3-methyl-6-(4-(trifluoromethyl)phenyl)imidazo[2,1-b]thiazole (mtfpmt) were easily prepared from thiourea, acetone (or trifluoroacetone), and α-bromoacetophenone as novel primary ligands. These were used to synthesize ten phosphorescent iridium complexes with picolinate (pic), isoquinoline-5-carboxylic acid (3-IQA), quinoline-2-carboxylic acid (2-QA), phenyl isoquinoline (piq), and 1,4-difluorophenyl pyrimidine (dfppy) as ancillary ligands. Their structures, photoluminescence, and electrochemistry were investigated. The introduction of trifluoromethyl groups at the phenyl ring of mpmt and to mtfpmt blue shifts the emission spectra of Ir³⁺ complexes by about 50 nm, and the corresponding emission peaks in CH₂Cl₂, which shifted from 545 to 613 nm, were observed at room temperature with an increase in the corresponding internal quantum efficiencies (IQEs) from 5.8% to 31.6%. Constructed with title complexes as emitters, LED chips based on InGaN chip excitation show good performances. Particularly, a device based on (mpmt)₂Ir(2-QA) showed the best red light emission with a CIE (0.64, 0.30), a CRI of 72.0, and a color purity that was over 80%. Also, a device based on (mpmt)₂Ir(3-IQA) provided a maximum luminescence efficiency of 3.01 lm W⁻¹. These results suggest that the title complexes have potential applications in LED chips and OLEDs.

中文翻译：

合成和一系列具有咪唑并[2,1-铱络合物的性质b ]噻唑衍生物作为配体的主†

从硫脲容易制备3-甲基-6-苯基咪唑并[2,1 - b ]噻唑（mpmt）和3-甲基-6-（4-（三氟甲基）苯基）咪唑并[ 2,1- b ]噻唑（mtfpmt），丙酮（或三氟丙酮）和α-溴乙酰苯作为新型主要配体。这些被用来合成十个吡啶鎓（pic），异喹啉-5-羧酸（3-IQA），喹啉-2-羧酸（2-QA），苯基异喹啉（piq）和1,4-的铱铱配合物。二氟苯基嘧啶（dfppy）作为辅助配体。研究了它们的结构，光致发光和电化学。在mpmt和mtfpmt蓝的苯环上引入三氟甲基使Ir ³⁺配合物的发射光谱移动了约50 nm，并在CH中产生了相应的发射峰在室温下观察到₂ Cl₂从545 nm转移到613 nm，相应的内部量子效率（IQEs）从5.8％增加到31.6％。以标题配合物为发射体构建的，基于InGaN芯片激发的LED芯片表现出良好的性能。特别地，基于（mpmt）₂ Ir（2-QA）的设备显示出最佳的红色发光，其CIE（0.64，0.30），CRI为72.0，并且色纯度超过80％。而且，基于（mpmt）₂ Ir（3-IQA）的器件提供了3.01 lm W^-1的最大发光效率。这些结果表明标题复合物在LED芯片和OLED中具有潜在的应用。

更新日期：2019-03-14

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