|
Semiconductor Physics, Quantum Electronics & Optoelectronics. 2013. V. 16, N 2. P. 210-215.
Europium coordination compounds
based on carbacylamidophosphate ligands
for metal-organic light-emitting diodes (MOLEDs)
Abstract. In this work, the photo- and electroluminescence properties of new red phosphores based on europium complexes with carbacylamidophosphate (CAPh) ligands and additional aromatic ligands 1,10-phenantroline and 4,4'-bipyridine have been studied. Compounds Eu(L1)3(phen) (1), Eu(L2)3(phen) (2), Eu2(L1)6(i-prOH)2(4,4'-bipy) (3) and Eu2(L2)6(H2O)2(4,4'-bipy) (4), where HL1 – 2,2,2-trichloro-N-(dipiperidin-1-yl-phosphoryl)acetamide, HL2 – 2,2,2-trichloro-N-(dimorpholin-1-yl-phosphoryl)acetamide, were synthesized. Technology of europium complexes coating from solutions with different concentrations in different solvents has been developed. Experimental samples of light-emitting planar heterostructures were fabricated using the device architecture comprising an anode (ITO), a hole transport layer of 1,4-Bis(diphenylamino)benzene (BDB), a layer of complex and a cathode (Al or Mg). Another heterostructure configuration with a hole-transport layer of poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) has also been investigated. The different types of planar heterostructures were prepared, and their current-voltage characteristics have been discussed.
Keywords: red photoluminescence, electroluminescence, europium complex, carbacylamidophosphate, metal-organic electroluminescent device, light-emitting planar heterostructure, current-voltage characteristic.
| ||