Efficient red electroluminescence from organic devices using dye-doped rare earth complexes

Abstract

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Encapsulating Eu3+ complex doped layers to improve Si‐based solar cell efficiency

“…In fact, due to the shielding effect of electrons in the outer shells, inner 4f electronic transitions of the rare earth ions give rise to a narrow emission band which is insensitive to the chemical environment. 16 Conversely, the excitation spectrum of the peak at 612 nm is strongly dependent on the sensitizer. In fact, in PLE spectroscopy, the intensity of a fixed emission (in the present case the emission at 612 nm) is recorded as a function of the excitation wavelength.…”

Synthesis and Optoelectronic Characterization of a Monochromic Red-Emitting Europium(III) Complex Containing Triphenylamine-Functionalized Phenanthroline

“…As an important family of luminescent materials, europium(III) complexes have been widely studied as emitters in organic/polymer light-emitting devices (OLEDs and PLEDs) because of their nearly monochromic red emission from f-orbit electron transition of europium(III) ion and theoretically 100% internal quantum efficiency resulting from both singlet and triplet excitonic emissions in the luminescence process. , Among these europium(III) complex-doped devices, OLEDs fabricated by vacuum deposition have made a great deal of progress in recent decades. − For example, Ma et al made a high-efficiency OLED with a maximum brightness of 2450 cd/m 2 at 20 V and a luminance efficiency of 9.0 cd/A at 0.012 mA/cm 2 , in which tris(dibenzoylmethanato)(3,4,7,8-tetramethyl-1,10-phenanthroline)europium(III) was used as an emitter and 4-(dicyanomethylene)-2- t -butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4 H -pyran as a host matrix . Huang et al obtained sharply red emission with a luminance of 1305 cd/m 2 at 16 V using tris(dibenzoylmethanato)(2−4′-triphenylamino)imidazo[4,5- f ]1,10-phenanthroline)europium(III) as an emitting center .…”

Semiconductor Physics, Quantum Electronics & Optoelectronics. 2016. V. 19, N 4. P. 343-351. DOI: https://doi.org/10.15407/spqeo19.04.343 SrTiO3:Eu3+ phosphors prepared by sol-gel synthesis: Structural characterization, magnetic properties and luminescence spectroscopy study

“…Among other rare earth ions, europium is a special element as dopant, because it exhibits not only the property of valence fluctuation (i.e., the valence state may be divalent or trivalent), but the luminescent of Eu 3+ doped materials are greatly influenced by the matrix as well (the so-called spectroscopic probe). Indeed, the short overview of the emission properties of europiumdoped materials clearly confirms this statementluminescence of the accommodated Eu 3+ ions strongly depends on both spatial distribution and nature of coordinated ligands [16][17][18][19][20][21]. So, the difference in optical properties of supposedly the same SrTiO 3 :Eu 3+ product obtained by different synthetic procedure clearly indicates the differences of the local environment of emitting ions [16,[22][23][24][25][26].…”