Highly efficient and color-tuning electrophosphorescent devices based on CuI complex

Abstract

Highly efficient electrophosphorescence from organic light-emitting devices based on a CuI complex, [Cu(DPEphos)(Dicnq)]BF4 (DPEphos=bis[2-(diphenylphosphino)phenyl]ether and Dicnq=6,7-Dicyanodipyrido[2,2-d:2′,3′-f] quinoxaline), doped into 4,4′-N,N′-dicarbazole-biphenyl is demonstrated. The performances of these devices fabricated by vacuum vapor deposition technique are among the best reported for devices incorporating CuI complexes as emitters. A low turn-on voltage of 4V, a maximum current efficiency up to 11.3cd∕A, and a peak brightness of 2322cd∕m2 were achieved, respectively. The phosphorescent operating mechanism of organic light-emitting devices based on CuI complex was discussed. Electroluminescent colors can be tuned ranging from green-yellow to orange-red region, and its band tail at longer wavelength can cover near infrared.

Novel Heteroleptic CuI Complexes with Tunable Emission Color for Efficient Phosphorescent Light‐Emitting Diodes

“…[7][8][9] Recently, we and other groups have reported green and white OLEDs based on these Cu I complexes. [10][11][12][13][14][15][16] Remarkable electroluminescent (EL) performance with the external quantum efficiency up to 16 % has been realized. [11] For full-color displays, emitters with high photoluminescence (PL) quantum yield and tunable emission color are crucial.…”

High Efficiency Red Phosphorescent Organic Light-Emitting Diodes with Simple Structure

“…Other host materials such as 4,4',4"-tris(N-carbazolyl)-triphenylamine (TCTA), 3-phenyl-4-(1'-naphthyl)-5-phenyl-1,2,4-triazole (TAZ), 1,3,5-tris(N-phenylbenzimidizol-2yl)benzene (TPBI) and aluminum (III) bis(2-methyl-8-quinolinato)-4-phenylphenolate (BAlq) for PHOLEDs are also commercially available and used as a matter of convenience for many guest-host applications (Zhou et al, 2003;Che et al, 2006;J. H. Kim et al, 2003).…”

Switching‐on: The Copper Age

“…Many efforts have been made in this area in recent years with promising results, making these systems potentially attractive for optoelectronic devices such as OLED stacks [22][23][24]53], light-emitting electrochemical cell (CELL) [122,123], or dye-sensitized solar cells [121,124]. They exhibit good current-to-light efficiency and even color tuning; however, the device lifetime is still an issue.…”