Abstract
Organic light-emitting diodes (OLEDs) with multiple-quantum-well structures, which consist of acromatic diamine and bathocuproine have been fabricated. The structure of the device is ITO/[NPB/BCP]n/AlQ/LiF/Al. The effect of the multiple-quantum-well (MQW) structure on the performance of OLEDs with tris (8-hydroxyquinoline) aluminum as the emitting material has been investigated. The emitting zone can be changed with the number of MQW. The maximum brightness of white emitting device reaches 3433.8 cd/m2. The luminous efficiency is 2.26 cd/A at the current density of 60.9 mA/cm2. The brightness of the diode with the MQW number of 5 has been reached 8661.0 cd/m2 with respect to 2512.8 cd/m2 of the conventional green emitting diode without the MQW structure (ITO/NPB/AlQ/LiF/Al). The highest luminous efficiency is 4.94 cd/A at the current density of 20 mA/cm2. Such an improvement in the device performance should be attributed to the improved hole-electron balance, which can be further attributed to the introduction of the MQW structure.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 171-174 |
| Number of pages | 4 |
| Journal | Guangdianzi Jiguang/Journal of Optoelectronics Laser |
| Volume | 18 |
| Issue number | 2 |
| State | Published - Feb 2007 |
| Externally published | Yes |
Keywords
- Carrier
- Hole injection
- Organic light-emitting diodes (OLED)
- Performance of devices
ASJC Scopus subject areas
- Electrical and Electronic Engineering