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Updated: Jan 17, 2026
High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
Published on: April 16, 2017
Temperature-Dependent Luminescence Spectroscopy in Europium Complexes Based on Phthalic Acid: The Effect of
Raúl Erick Guzmán-Silva1, Christian Javier Salas-Juárez2, Karla Scanda1
1Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, del Instituto Politécnico Nacional, CDMX, Mexico.
Abstract:
Thermal luminescence stability is a key challenge in developing luminescent materials for various applications. Photoluminescent properties of two red-emitting complexes, [Eu (PHT)3·H2O] and [Eu (PHT)3], were studied. Infrared spectroscopy demonstrated characteristic νas (COO-) and νs (COO-) bands of coordinated carboxylates. Photoluminescence confirms an effective ligand to metal energy transfer in the [Eu (PHT)3⸱H2O] and [Eu (PHT)3] complexes, resulting in the characteristic Eu3+ ion transitions corresponding to 5D0 → 7FJ (J = 0-4). Luminescence lifetime (τ), Absolute Quantum Yield (Ф), and quantum efficiency (η) revealed an increase of nonradiative deactivation channels in the [Eu (PHT)3⸱H2O] complex due to the presence of O-H oscillators when compared to the [Eu (PHT)3] complex. Photometric analysis placed both complexes in close agreement with NTSC red coordinates (x = 0.67, y = 0.33), and full color-purity values above 93%. The temperature-dependent luminescence of the [Eu (PHT)3] complex exhibited thermal stability up to 423 K, maintaining a signal of 70%. In contrast, the initial intensity of the [Eu (PHT)3·H2O] complex increases up to 50% in the 393-413 K range, causing intensity variations and reduced reproducibility suggested by the presence of the water molecule. These results indicate that the anhydrous [Eu (PHT)3] complex is an efficient red-emitting phosphor for optoelectronic devices.
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