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

Hong, Z. R.; Lee, C. S.; Lee, S. T.; Li, W. L.; Liu, S. Y.
April 2003
Applied Physics Letters;4/7/2003, Vol. 82 Issue 14, p2218
Academic Journal
Using rare earth complexes with electron-transporting properties as host materials, and 4-(dicyanomethylene)-2-t-butyl-6(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H- pyran (DCJTB) as a dopant, bilayer doped electroluminescent (EL) devices with efficient red light emission were fabricated. When a europium complex was adopted, the EL spectrum consisted of emissions from DCJTB and Eu[sup 3+] ions. At optimal dopant concentration, an EL efficiency of 5.7 cd/A at 0.04 mA/cm² was observed. Although the EL efficiency decreased with an increase in current density, it remained higher than 2.0 cd/A with brightness of 347.0 cd/m² at 5.7 V bias. DCJTB and Eu[sup 3+] ions collected the energy of singlet and triplet excitons, respectively, and then gave rise to pure red color emission, suggesting a promising way by which to utilize both singlet and triplet excited states in EL devices.


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