High-efficiency red electroluminescence from a narrow recombination zone confined by an organic double heterostructure
High-efficiency red electroluminescence from a narrow recombination zone confined by an organic double heterostructure
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DOI：
10.1063/1.1390479
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发表时间：
2001-08
影响因子：
4
通讯作者：
Zhiyuan Xie;L. Hung;S. Lee
中科院分区：
文献类型：
--
作者：
Zhiyuan Xie;L. Hung;S. Lee
研究了传统双层结构和双异质结构的红光发光二极管。在这些LED中，N，N′-双-（1-萘基）-二苯基-1，1′-联苯-4，4 ′-二胺（NPB）、2，9-二甲基-4，7-二苯基-1，10-菲咯啉（BCP）和三（8-羟基喹啉）铝（Alq 3）分别用作空穴传输层、空穴阻挡层和电子传输层。双层和DH LED分别具有ITO/NPB/Alq 3：红色掺杂剂/Alq 3/MgAg和ITO/NPB/Alq 3：红色掺杂剂/BCP/Alq 3/MgAg的配置。三种红色荧光染料-尼罗红，DCJTB和DCM-被用作掺杂剂。与双层结构相比，DH LED的发光效率提高了100%。我们将效率的提高归因于形成了一个狭窄的复合区，其中载流子和激子都被限制。发光层中的高电荷浓度导致电子-空穴复合过程中的有效碰撞捕获。
Red light-emitting diodes (LEDs) with both a conventional bilayer structure and a double heterostructure (DH) have been investigated. In these LEDs, N,N′-bis-(1-naphthl)-diphenyl-1, 1′-biphenyl-4,4′-diamine (NPB), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), and tris(8-quinolinolato) aluminum (Alq3) were used as hole-transporting, hole-blocking, and electron-transporting layers, respectively. The bilayer and DH LEDs had a configuration of ITO/NPB/Alq3:red dopant/Alq3/MgAg and ITO/NPB/Alq3:red dopant/BCP/Alq3/MgAg, respectively. Three kinds of red fluorescent dyes—nile red, DCJTB, and DCM—were used as dopants. Compared with the bilayer structures, the luminance efficiencies of the DH LEDs were found to increase as much as 100%. We attribute the efficiency enhancement to the formation of a narrow recombination zone, in which both charge carriers and excitons were confined. High charge concentrations in the emissive layer resulted in efficient collision capture in the electron–hole recombination proc...