TY - JOUR
T1 - Bright, efficient, deep blue-emissive polymer light-emitting diodes of suitable hole-transport layer and cathode design
AU - Lin, Ming Wei
AU - Chen, Ruei Tang
AU - Yeh, Chia Hsin
AU - Wen, Ten Chin
AU - Guo, Tzung Fang
N1 - Funding Information:
The authors would like to thank the National Science Council (NSC) of Taiwan ( NSC99-2113-M-006-008-MY3 ) and the Asian Office of Aerospace Research and Development ( AOARD-10-4054 ) for financially supporting this research. The technical discussions in PL measurements from Prof. Bin Hu at The University of Tennessee, Knoxville, Department of Materials Science and Engineering is highly appreciated.
PY - 2012/12
Y1 - 2012/12
N2 - This study reports the fabrication of efficient deep blue-emissive polymer light-emitting diodes (PLEDs), incorporating a polyfluorene derivative of nonsymmetric and bulky aromatic groups at C-9 position as the light-emissive layer. Another poly(fluorene-co-triphenylamine) (PFO-TPA) derivative of the highest occupied molecular orbital level, -5.3 eV, is used as the hole-injection and -transport layer in the anode part. The thermally crosslinking of styryl groups in PFO-TPA inhibits the solvation of an interlayer in constructing the multilayer device architecture of PLEDs. While applying a cesium carbonate (Cs2CO3)/Aluminum (Al) cathode rather than Calcium (Ca)/Al, the device has the superior performance (i.e. one order of magnitude higher). Experimental results indicate that the interfacial reactions at the polymer/Ca junction, as characterized in this study, significantly degrade the luminescence properties and the device performance. Moreover, Cs 2CO3/Al is a highly favorable cathode in fabricating polyflourene-based PLEDs. The device of the optimal configuration has a decent deep blue emission centered at 430-450 nm of the Commission Internationale de l'Eclairage chromaticity coordinates, (0.15, 0.14), with a maximum brightness of 35054.2 cd/m2 and luminous efficiency of 14.0 cd/A (at 2975.0 cd/m2).
AB - This study reports the fabrication of efficient deep blue-emissive polymer light-emitting diodes (PLEDs), incorporating a polyfluorene derivative of nonsymmetric and bulky aromatic groups at C-9 position as the light-emissive layer. Another poly(fluorene-co-triphenylamine) (PFO-TPA) derivative of the highest occupied molecular orbital level, -5.3 eV, is used as the hole-injection and -transport layer in the anode part. The thermally crosslinking of styryl groups in PFO-TPA inhibits the solvation of an interlayer in constructing the multilayer device architecture of PLEDs. While applying a cesium carbonate (Cs2CO3)/Aluminum (Al) cathode rather than Calcium (Ca)/Al, the device has the superior performance (i.e. one order of magnitude higher). Experimental results indicate that the interfacial reactions at the polymer/Ca junction, as characterized in this study, significantly degrade the luminescence properties and the device performance. Moreover, Cs 2CO3/Al is a highly favorable cathode in fabricating polyflourene-based PLEDs. The device of the optimal configuration has a decent deep blue emission centered at 430-450 nm of the Commission Internationale de l'Eclairage chromaticity coordinates, (0.15, 0.14), with a maximum brightness of 35054.2 cd/m2 and luminous efficiency of 14.0 cd/A (at 2975.0 cd/m2).
UR - http://www.scopus.com/inward/record.url?scp=84867354049&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84867354049&partnerID=8YFLogxK
U2 - 10.1016/j.orgel.2012.09.009
DO - 10.1016/j.orgel.2012.09.009
M3 - Article
AN - SCOPUS:84867354049
SN - 1566-1199
VL - 13
SP - 3067
EP - 3073
JO - Organic Electronics
JF - Organic Electronics
IS - 12
ER -