TY - JOUR
T1 - Improvement in polymer light-emitting diode performance using polymer heterojunction structure prepared by evaporative spray deposition from ultradilute solution
AU - Shakutsui, Masato
AU - Fujita, Katsuhiko
AU - Tsutsui, Tetsuo
PY - 2006/8/11
Y1 - 2006/8/11
N2 - We successfully demonstrated a significant improvement in polymer light-emitting diode performance by employing a polymer bilayer structure prepared by evaporative spray deposition from ultradilute solution (ESDUS). The bilayer structure consisted of two π-conjugated polymers, where the top layer was deposited from tetrahydrofuran (THF) solution by ESDUS onto the preceding bottom layer composed of the other THF-soluble polymer. The external quantum efficiency (EQE) of the bilayer device is improved markedly in comparison with that of a corresponding single-layer device prepared by conventional spin-coating. Moreover, the EQE of the bilayer device tends to be constant throughout a wide current region, whereas that of single-layer devices increases gradually with current density. These observations indicate that carriers are effectively blocked at the polymer/polymer interface of the bilayer device.
AB - We successfully demonstrated a significant improvement in polymer light-emitting diode performance by employing a polymer bilayer structure prepared by evaporative spray deposition from ultradilute solution (ESDUS). The bilayer structure consisted of two π-conjugated polymers, where the top layer was deposited from tetrahydrofuran (THF) solution by ESDUS onto the preceding bottom layer composed of the other THF-soluble polymer. The external quantum efficiency (EQE) of the bilayer device is improved markedly in comparison with that of a corresponding single-layer device prepared by conventional spin-coating. Moreover, the EQE of the bilayer device tends to be constant throughout a wide current region, whereas that of single-layer devices increases gradually with current density. These observations indicate that carriers are effectively blocked at the polymer/polymer interface of the bilayer device.
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U2 - 10.1143/JJAP.45.L790
DO - 10.1143/JJAP.45.L790
M3 - Article
AN - SCOPUS:34548418829
VL - 45
SP - L790-L792
JO - Japanese Journal of Applied Physics, Part 2: Letters
JF - Japanese Journal of Applied Physics, Part 2: Letters
SN - 0021-4922
IS - 29-32
ER -