Narrow bandwidth red electroluminescence from solution-processed lanthanide-doped polymer thin films

Abstract

Narrow bandwidth red electroluminescence from OLED devices fabricated using a simple solution-based approach is demonstrated. A spin-casting method is employed to fabricate organic light emitting diode (OLED) devices comprising a poly(N-vinylcarbazole) (PVK) host matrix doped with a europium h-diketonate complex, Eu(dbm) 3 (Phen) (dibenzoylmethanate, dbm; 1,10-phenanthroline, Phen) on glass/ indium tin oxide (ITO)/3,4-polyethylene-dioxythiophene-polystyrene sulfonate (PEDOT) substrates. Saturated red europium ion emission, based on the 5 D 0 Y 7 F 2 transition, is centered at a wavelength of 612 nm with a full width at half maximum of 3.5 nm. A maximum external quantum efficiency of 6.3 Â 10 À 2 cd/A (3.1 Â10 À 2 %) and a maximum luminance of 130 cd/m 2 at 400 mA/cm 2 and 25 V is measured for ITO/PEDOT/PVK:Eu(dbm) 3 (Phen)/Ca/Al devices. This measured output luminance is comparable to that of devices fabricated using more sophisticated small molecule evaporation techniques.

Printable luminescent down shifter for enhancing efficiency and stability of organic photovoltaics

“…For the Eu:PMMA sample, UV absorption occurred from 300nm up to around 415nm with the peak absorption occurring at λpeak,abs ≈360nm. A narrow luminesce is observed with a peak emission at 610nm, which is consistent with other europium phosphor complexes [20]. Overlaid on the data is the External Quantum Efficiency (EQE) of a P3HT:PCBM OPV and it is apparent that the LDS material has an the overlap in the emission spectrum with the EQE of P3HT:PCBM.…”

Ionic liquid as plasticizer for europium(iii)-doped luminescent poly(methyl methacrylate) films

“…[1][2][3][4][5][6][7] Processable lanthanide-based luminescent molecular materials can be obtained by doping the lanthanide(III) complex in a polymer matrix. 8,9 Typical applications of such polymer films are in organic light emitting diodes (OLEDs) [10][11][12][13][14] or in active optical polymer fibers for data transmission. [15][16][17] A popular polymer matrix for use as host for luminescent lanthanide complexes is poly-(methyl methacrylate) (PMMA), which is transparent at wavelengths longer than 250 nm.…”

Polymer light-emitting devices based on europium(III) complex with 11-bromo-dipyrido[3,2-a:2′,3′-c]phenazine

“…Compared to the high efficiency of red-emitting iridium(III) and platinum(II) complexes [3][4][5][6][7], europium(ІІІ) complexes exhibit considerable advantages because of their extremely narrow emission spectral bandwidth. Recently, spin-casting techniques have been used to fabricate europium(III) complex-doped polymer light-emitting diodes (PLEDs) containing conjugated polymers as the host matrix [8][9][10][11][12][13][14][15][16][17][18][19][20]. PLEDs formed by this method can be simply fabricated by solution processing, and luminescence quenching by concentration effects is prevented.…”