Polymer light emitting diode using PFT--poly(9,9'-n-dihexil-2,7-fluorenodiilvinylene-alt-2,5thiophene).
The development of new electroluminescence polymers for specific colour tuning in Polymer Light Emitting Devices (PLEDs) is currently one of the most important fields for organic electronics. This work reports a synthesis of a new electroluminescent polymer and the concomitant test as PLED emissive layer. The polymer, synthesised from fluorene, is poly(9,9'-n-dihexil-2,7-fluorenodiilvinylene-alt-2,5thiophene) or PFT. The luminescence shows large bands with maxima around 480 nm in absorption and 560 nm in emission. The device was made in a three layer structure, with PEDOT:PSS as hole transport layer, PFT as emissive layer and butyl-PBD as electron transport layer. The electroluminescence spectrum shows a strong band peaked at 540 nm. For an applied voltage of 12 Volt, the brightness at normal angle of viewing is near 10 cd/m2 and the luminous efficiency is of 0.01 lm/W. A discussion about carrier transport and the electroluminescence properties is made.
Santos
G
G
Laboratório de Microeletrônica, Departamento de Engenharia de Sistemas Eletrônicos, Escola Politécnica da Universidade de São Paulo, Av. Prof. Luciano Gualberto, trav 3, no 380, CEP 05508-900, São Paulo, SP Brasil.
Fonseca
F J
FJ
Andrade
A M
AM
Grova
I
I
Akcelrud
L
L
Pereira
L
L