Fabrication of red organic light emitting diodes (OLEDs) using EuxY(1-x)(TTA)3Phen organic complexes for solid-state lighting

Abstract

The mechanism of energy transfer leading to electroluminescence (EL) of a lanthanide complex, Eu x Y (1-x) (TTA) 3 Phen (TTA= thenoyltrifluoro-acetone, phen=1,10-phenanthroline), doped into TPBi(1,3,5-tris(N-Phenyl-benzimidizol-2-yl) benzene host at 15 wt% of host is investigated. With the device structure of anode/hole transport layer/Eu x Y (1-x) (TTA) 3 Phen (15%): TPBi/electron transport layer/cathode, maximum luminescence of 185.6 cd/m 2 and 44.72 cd/m 2 was obtained from device I made of Eu 0.4 Y 0.6 (TTA) 3 Phen and device II made of Eu 0.5 Y 0.5 (TTA) 3 Phen, respectively at 18 volts. Saturated red Eu 3+ emission based on 5 D 0 → 7 F 2 transition is centered at a wavelength of 612 nm with a full width at half maximum of 5 nm. From the analysis of I-V, J-V-L characteristics and electroluminescent (EL) spectra, we conclude that direct trapping of holes and electrons and subsequent formation of the excitation occur on the dopant, leading to high quantum efficiencies at low current densities. These results show that fabricated OLED devices can successfully emit saturated red light and can be used in applications such as opto-electronic OLED devices, displays and solid state lighting technology.

Photoluminescence of Alq3‐ and Tb‐activated aluminium–tris(8‐hydroxyquinoline) complex for blue chip‐excited OLEDs

“…While full‐colour organic light‐emitting diodes (OLEDs) have gained tremendous increase in performance over the last decade, recently red organic light‐emitting diodes have been fabricated, with the device structure ITO/m‐MTDATA/ α ‐NPD/TPBi:Eu( x )Y(1 – x ) (TTA)3 Phen/Alq 3 /LiF:Al (where x = 0.4 or 0.5). Maximum luminescence of 185.6 cd/m 2 and 44.72 cd/m 2 was obtained from device I, made of Eu 0.4 Y 0.6 (TTA) 3 Phen, and device II, made of Eu 0.5 Y 0.5 (TTA) 3 Phen, at 18 V .…”

Room Temperature Synthesis and Characterization of Novel Bi(III) Complex with 2-Amino-3- Carbomethoxy-4,5,6,7-Tetrahydrobenzo[B]Thiophene as Potential Antimicrobial Agent

“…In fact, combining properties of metal ion like magnetic, optic, conductor, oxydoreduction, biological with the one of an organic chelate compound can lead to new hybrid coordination complexes with enhanced functionalities. There-fore, many coordination compounds with properties like antimicrobial, [1][2][3][4] AND-binding, 5 antiviral, anticancerous, cytotoxic, 6 anti-inflammatory, 7,8 analgesic, 9 antioxidant, 10,11 optoelectronic, superconductor, non-linear optical (NLO), 12,13 light emitting device (LED), 14,15 catalyst, antidiabetic, 16,17 gas storage, metaloenzyme, 18 nanoparticles 19,20 have been reported.…”

Enhanced luminescence and white light emission from Eu3+‐co‐doped K3Ca2(SO4)3Cl:Dy3+ phosphor with near visible ultraviolet excitation for white LEDs

“…The rare earth ions Eu 3+ and Dy 3+ are recognized as activators for many different inorganic lattices. Phosphors doped with Eu 3+ typically emit red or orange–red light , due to the intraconfigurational f–f transitions of Eu 3+ from the excited 5 D 0 state to the 7 F j ( j = 1, 2, 3, 4, 5) levels of 4f 6 . The 4f energy levels of Eu 3+ are almost unaffected by the crystal field.…”

“…For example, SrAl 2 O 4 host material co-doped with Eu 3+ and Dy 3+ is known as a newgeneration long-lasting luminescent phosphor material (8). Zhang typically emit red or orange-red light (11)(12)(13), due to the intraconfigurational f-f transitions of Eu 3+ (14) from the excited 5 D 0 state to the 7 F j (j = 1, 2, 3, 4, 5) levels of 4f 6 . The 4f energy levels of Eu 3+ are almost unaffected by the crystal field.…”