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Eu3+ -tetrakis β-diketonate complexes for solid-state lighting application.
Luminescence ( IF 2.9 ) Pub Date : 2019-07-25 , DOI: 10.1002/bio.3686
Camila M B Leite Silva 1, 2 , Airton G Bispo-Jr 1, 2 , Felipe S M Canisares 1, 2 , Shirley A Castilho 1 , Sergio A M Lima 1, 2 , Ana M Pires 1, 2
Affiliation  

Eu3+ -β-diketonate complexes are used, for example, in solid-state lighting (SSL) or light-converting molecular devices. However, their low emission quantum efficiency due to water molecules coordinated to Eu3+ and low photostability are still problems to be addressed. To overcome such challenges, we synthesized Eu3+ tetrakis complexes based on [Q][Eu(tfaa)4 ] and [Q][Eu(dbm)4 ] (Q1 = C26 H56 N+ , Q2 = C19 H42 N+ , and Q3 = C17 H38 N+ ), replacing the water molecules in the tris stoichiometry. The tetrakis β-diketonates showed desirable thermal stability for SSL and, under excitation at 390 nm, they displayed the characteristic Eu3+ emission in the red spectral region. The quantum efficiencies of the dbm complexes achieved values as high as 51%, while the tfaa complexes exhibited lower quantum efficiencies (28-33%), but which were superior to those reported for the tris complexes. The structures were evaluated using the Sparkle/PM7 model and comparing the theoretical and the experimental Judd-Ofelt parameters. [Q1][Eu(dbm)4 ] was used to coat a near-UV light-emitting diode (LED), producing a red-emitting LED prototype that featured the characteristic emission spectrum of [Q1][Eu(dbm)4 ]. The emission intensity of this prototype decreased only 7% after 30 h, confirming its high photostability, which is a notable result considering Eu3+ complexes, making it a potential candidate for SSL.

中文翻译:

用于固态照明应用的Eu3 +-四烷基β-二酮酸酯络合物。

Eu3 +-β-二酮酸酯络合物用于例如固态照明(SSL)或光转换分子器件中。然而,由于水分子与Eu3 +配位而产生的低发射量子效率和低光稳定性仍是有待解决的问题。为了克服这些挑战,我们基于[Q] [Eu(tfaa)4]和[Q] [Eu(dbm)4](Q1 = C26 H56 N +,Q2 = C19 H42 N +和Q3 = C17 H38 N +),取代了tris化学计量的水分子。β-二酮四烷基酯对SSL表现出理想的热稳定性,在390 nm激发下,它们在红色光谱区显示出特征性Eu3 +发射。dbm配合物的量子效率高达51%,而tfaa配合物显示出较低的量子效率(28-33%),但优于tris配合物报道的那些。使用Sparkle / PM7模型评估了结构,并比较了理论和实验的Judd-Ofelt参数。[Q1] [Eu(dbm)4]用于涂覆近紫外发光二极管(LED),从而生产出具有[Q1] [Eu(dbm)4]特征发射光谱的发红光的LED原型。 。该原型的发射强度在30 h后仅降低了7%,证实了其高的光稳定性,考虑到Eu3 +复合物,这是一个显着的结果,使其成为SSL的潜在候选者。生产出具有[Q1] [Eu(dbm)4]特征发射光谱的发红光LED原型。该原型的发射强度在30 h后仅降低了7%,证实了其高的光稳定性,考虑到Eu3 +复合物,这是一个显着的结果,使其成为SSL的潜在候选者。生产出具有[Q1] [Eu(dbm)4]特征发射光谱的发红光LED原型。该原型的发射强度在30 h后仅降低了7%,证实了其高的光稳定性,考虑到Eu3 +复合物,这是一个显着的结果,使其成为SSL的潜在候选者。
更新日期:2019-12-11
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