Phosphorescent Carbene-Gold-Arylacetylide Materials as Emitters for Near UV-OLEDs.
Phosphorescent Carbene-Gold-Arylacetylide Materials as Emitters for Near UV-OLEDs.
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磷光卡宾-金-芳基乙炔材料作为近紫外 OLED 的发射体。
DOI：
10.1002/adma.202306249
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发表时间：
2024
期刊：
影响因子：
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通讯作者：
Brannan AC
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作者：
Brannan AC
合成了一系列卡宾-金-乙炔化物配合物[（BiCAAC）AuCC] nC 6 H5 −n（n= 1，Au 1;n= 2，Au 2;n= 3，Au 3; BiCAAC =双环（烷基）（氨基）卡宾）。化合物Au 1-Au 3在所有介质中均表现出深蓝色至蓝绿色磷光，具有高达43%的良好量子产率。Au_（1-Au_（3））中（BiCAAC）Au基团的增加使紫外-可见吸收光谱的消光系数增大，并使振子强度系数增大。发光辐射率随（BiCAAC）Au基团的增加而降低。时间依赖密度泛函理论研究支持磷光的电荷转移性质，这是由于单重激发态（S1）和三重激发态（T1）之间的大（0.5-0.6 eV）能隙。瞬态发光研究揭示了非结构化UV即时荧光和振动分辨长寿命磷光428 nm的存在。以2，8-二（二苯基磷酰基）二苯并[B，d]呋喃（PPF）为基质材料，配合Au 1，采用物理气相沉积法制备了有机电致发光器件（OLED）。在405 nm处观察到近紫外电致发光，器件效率为1%，同时在10尼特的实际亮度下证明OLED器件寿命LT 50高达20 min，表明一类非常有前途的材料可用于开发稳定的UV-OLED。
A series of carbene‐gold‐acetylide complexes [(BiCAAC)AuCC]nC6H5−n(n= 1,Au1;n= 2,Au2;n= 3,Au3; BiCAAC = bicyclic(alkyl)(amino)carbene) have been synthesized in high yields. CompoundsAu1–Au3exhibit deep‐blue to blue‐green phosphorescence with good quantum yields up to 43% in all media. An increase of the (BiCAAC)Au moieties in gold complexesAu1–Au3increases the extinction coefficients in the UV–vis spectra and stronger oscillator strength coefficients supported by theoretical calculations. The luminescence radiative rates decrease with an increase of the (BiCAAC)Au moieties. The time‐dependent density functional theory study supports a charge‐transfer nature of the phosphorescence due to the large (0.5–0.6 eV) energy gap between singlet excited (S1) and triplet excited (T1) states. Transient luminescence study reveals the presence of both nonstructured UV prompt‐fluorescence and vibronically resolved long‐lived phosphorescence 428 nm. Organic light‐emitting diodes (OLED) are fabricated by physical vapor deposition with 2,8‐bis(diphenylphosphoryl)dibenzo[b,d]furan (PPF) as a host material with complexAu1. The near‐UV electroluminescence is observed at 405 nm with device efficiency of 1% while demonstrating OLED device lifetime LT50up to 20 min at practical brightness of 10 nits, indicating a highly promising class of materials to develop stable UV‐OLEDs.