Sky-blue tri-cyclometalated heteroleptic iridium (III) phosphors: Influence of ancillary ligand

IF 4.1 3区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Photochemistry and Photobiology A-chemistry Pub Date : 2024-11-19 DOI:10.1016/j.jphotochem.2024.116170

Ruijuan Yao , Xiaoxiao Hu , Qingzhe Meng , Jiuyan Li , Di Liu , Yanfang Zhu , Yuzhen Zhao , Zemin He

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Abstract

Two sky-blue tri-cyclometalated heteroleptic iridium complexes with the Ir(C^N)₂(C₁^N₁) framework, namely M₁ and M₂, were developed with (3,5-bis(trifluoromethyl)phenyl)pyridine (cf₃ppy) as the main cyclometalating ligand and 3-(1-benzyl-1H-1,2,3-triazol-4-yl)pyridine (pt) or 2′,6′-difluoro-2,3′-bipyridine (dfbpy) as the ancillary cyclometalating ligand. The effect of the C₁^N₁ ancillary ligand on the photophysical, thermal, electrochemical properties as well as the device performances were studied comparatively. It was revealed that the ancillary ligand pt favored to suppress the longer-wavelength vibronic band intensity and thus enhanced the blue color purity of the tris-cyclometalated iridium complex M₁. Sky-blue phosphorescent organic light-emitting diodes (OLEDs) were fabricated with these iridium phosphors as doped emitter. The M₁-based OLED exhibited better performance with improved color purity and reduced intensity at long-wavelength vibronic band, and a maximum current efficiency and external quantum efficiency of 28.2 cd/A and 12.5 %. This study provides a valid molecular design strategy to control the intensity of the shoulder vibronic sub-band for optimized color purity of cyclometalated iridium phosphors.

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天蓝色三环金属化异极铱(III)荧光粉：辅助配体的影响

研究人员开发了两种具有 Ir(C^N)2(C1^N1)框架的天蓝色三环甲基化杂环铱配合物，即 M1 和 M2，它们以 (3、5-双(三氟甲基)苯基)吡啶 (cf3ppy) 作为主环化配体，3-(1-苄基-1H-1,2,3-三唑-4-基)吡啶 (pt) 或 2′,6′-二氟-2,3′-联吡啶 (dfbpy) 作为辅助环化配体。比较研究了 C1^N1 辅助配体对光物理性质、热学性质、电化学性质以及器件性能的影响。结果表明，辅助配体 pt 有利于抑制较长波长的振子带强度，从而提高了三环甲基化铱配合物 M1 的蓝色纯度。以这些铱荧光粉作为掺杂发射极，制造出了天蓝色磷光有机发光二极管（OLED）。基于 M1 的有机发光二极管性能更佳，颜色纯度提高，长波长振子带强度降低，最大电流效率和外部量子效率分别为 28.2 cd/A 和 12.5%。这项研究提供了一种有效的分子设计策略，可以控制肩振子带的强度，从而优化环甲基化铱荧光粉的色纯度。

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来源期刊

Journal of Photochemistry and Photobiology A-chemistry 化学-物理化学

CiteScore

7.90

自引率

7.00%

发文量

580

审稿时长

48 days

期刊介绍： JPPA publishes the results of fundamental studies on all aspects of chemical phenomena induced by interactions between light and molecules/matter of all kinds. All systems capable of being described at the molecular or integrated multimolecular level are appropriate for the journal. This includes all molecular chemical species as well as biomolecular, supramolecular, polymer and other macromolecular systems, as well as solid state photochemistry. In addition, the journal publishes studies of semiconductor and other photoactive organic and inorganic materials, photocatalysis (organic, inorganic, supramolecular and superconductor). The scope includes condensed and gas phase photochemistry, as well as synchrotron radiation chemistry. A broad range of processes and techniques in photochemistry are covered such as light induced energy, electron and proton transfer; nonlinear photochemical behavior; mechanistic investigation of photochemical reactions and identification of the products of photochemical reactions; quantum yield determinations and measurements of rate constants for primary and secondary photochemical processes; steady-state and time-resolved emission, ultrafast spectroscopic methods, single molecule spectroscopy, time resolved X-ray diffraction, luminescence microscopy, and scattering spectroscopy applied to photochemistry. Papers in emerging and applied areas such as luminescent sensors, electroluminescence, solar energy conversion, atmospheric photochemistry, environmental remediation, and related photocatalytic chemistry are also welcome.