Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (04): 946-963.doi: 10.3866/PKU.WHXB20100415

• PHOTOCHEMISTRY AND SPECTROSCOPY • Previous Articles     Next Articles

Spectral Stability of Polyfluorene-Based Semiconductors

LIANG Jing, QIAN Yan, XIE Ling-Hai, SHI Nai-En, CHEN Shu-Fen, DENG Xian-Yu, HUANG Wei   

  1. Key Laboratory for Organic Electronics&Information Displays, Nanjing 210046; Institute of Advanced Materials, Nanjing University of Posts and Telecommunication, Nanjing 210046, P. R. China
  • Received:2009-06-01 Revised:2009-11-13 Published:2010-04-02
  • Contact: XIE Ling-Hai, HUANG Wei E-mail:iamlhxie@njupt.edu.cn; iamwhuang@njupt.edu.cn

Abstract:

The physical and chemical properties of organic semiconductors play key roles in the performance of optoelectronic devices. The manipulation of these properties offers research opportunities and challenges in physical chemistry. The spectral stability and the origin of the low-energy emission band (LEEB) in polyfluorenes-based blue light-emitting diodes have received much attention over the past few decades. In this review, we categorized various LEEB phenomena according to characterization and related mechanisms, including inter-chain aggregates and/or excimers, on-chain ketone defect emissions, interchain ketone-based excimers, and hydroxy-terminated oxidation on the interface of devices. Recent advances in highly stable blue light-emitting polyfluorenes are categorically summarized. This review highlighted the contributions of the steric hindrance effects of various nonplanar bulky groups, molecular conformations and topologies of chains and antioxidant hindered amine light stabilizers (HALS), together with physical blending as well as interface engineering.

Key words: Electroluminescent, Conjugated polymer, Polyfluorene, Low-energy emission band, Spectrum stability, Blue light-emitting semiconductor

MSC2000: 

  • O649