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One‐step Fabrication of π‐Conjugated Polymer Thin Films from Naphthalenes via Plasma Polymerization for Efficient Optoelectronic Devices: White Polymer Light‐emitting Diodes
Author(s) -
Chang ChunChih,
Chang YiHsin,
Hwang KuoChu,
Jou JwoHuei,
Yang Arnold C.M.
Publication year - 2011
Publication title -
plasma processes and polymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 74
eISSN - 1612-8869
pISSN - 1612-8850
DOI - 10.1002/ppap.201000110
Subject(s) - electroluminescence , materials science , photoluminescence , fabrication , polymer , polymerization , conjugated system , monomer , thin film , plasma , optoelectronics , plasma polymerization , oled , photochemistry , nanotechnology , layer (electronics) , chemistry , composite material , medicine , alternative medicine , physics , pathology , quantum mechanics
We describe a facile one‐step fabrication process of thin film conjugated polymers for efficient optoelectronic devices from naphthalenes by plasma polymerization through a new monomer feeding method. The resulting 3‐D aromatic chain networks of the polymerized films were in good agreement with the predictions based on monomer bond rupture routes analysis. The photoluminescence (PL) spectra of plasma‐polymerized films featured short‐lived inter‐molecular emissions arising from self‐assembly of the naphthalene units in the crosslinked architectures. When functioning between the electrodes for light emitting, the plasma films manifested electroluminescence (EL) spectra that showed a steep rise at the threshold wavelength red‐shifted relative to the PL spectra, indicating prevailing charge tunneling to lower excited states by the accumulated interfacial charges. The wide distribution of conjugation lengths in the plasma films provided the subsequent energy transfer routes and gave rise to the broad EL emission band that produced stable pure white light of CIE coordinates of (0.34, 0.33) with excellent efficiencies. This dry deposition process allows the use of multiple monomers for property tailoring and may be used for large‐area depositions.