Device physics of organic light-emitting diodes based on molecular materials
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- 作者：Brü ; tting ; Wolfgang ; Berleb ; Stefan ; Mü ; ckl ; Anton G.
- 关键词：Organic light-emitting diodes ; Charge carrier transport ; Space-charge limited conduction ; Charge carrier mobility ; Traps
- 刊名：Organic Electronics
- 出版年：2001
- 出版时间：March, 2001
- 年：2001
- 卷：2
- 期：1
- 页码：1-36
- 全文大小：1.57 M
文摘
Electrical transport in single- and hetero-layer organic light-emitting diodes based on aromatic amines like N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD) or N,N′-diphenyl-N,N′-bis(1-naphthyl)-1,1′-biphenyl-4,4′-diamine (NPB) and the aluminium chelate complex Alq (tris(8-hydroxyquinolato)aluminium) has been investigated as a function of temperature and organic layer thickness. It is shown that the thickness dependence of the current–voltage (I–V) characteristics provides a unique criterion to discriminate between (1) injection limited behaviour, (2) trap-charge limited conduction with an exponential trap distribution and a field-independent mobility, and (3) trap-free space-charge limited conduction (SCLC) with a field and temperature dependent mobility.