Synthesis of high triplet hosts for phosphorescentorganic light emitting diodes
Başlık çevirisi mevcut değil.
- Tez No: 626146
- Danışmanlar: DR. PAVEL ANZENBACHER
- Tez Türü: Doktora
- Konular: Kimya Mühendisliği, Chemical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2011
- Dil: İngilizce
- Üniversite: Bowling Green State University
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 156
Özet
Organic light-emitting diodes (OLEDs) have attracted significant attention for the application in next generation display technologies and solid state lightning due to their advantages, such as, the large viewing angle, range of colors, high brightness, low power consumption etc. In OLEDs, based on the type of emitter fluorescence or phosphorescence can be observed. If the emitter is florescent then internal quantum efficiency of OLEDs is limited to 25%. Introducing phosphorescent emitters to the OLEDs allows us to take advantage of spin statistics. The presence of heavy metal facilitates the intersystem crossing due to the spin-orbit coupling consequently the internal quantum efficiency can reach up to 100%. This type of OLED is classified as Phosphorescent OLED (PhOLED). Because the transition metal complexes are not the best conductors, in PhOLEDs, the phosphorescent emitter is often dispersed in a host material, which is usually a better conductor and is capable of energy transfer to phosphorescent emitters. In order to achieve efficient energy transfer; it is essential that the triplet energy of the host should be larger than that of guest to prevent reverse energy transfer from guest to the host. Moreover, efficient charge injection to active layer requires compatible energy levels of frontier orbitals for adjacent layer since efficiency of an OLED is correlated to recombination efficiency of electrons and holes. However, in order to obtain high triplet energy -conjugation of molecule should be confined which would inversely effect charge transport properties of molecule. Another requirement for an efficient OLED is materials should be thermally stable to prevent the degradation of devices.
Özet (Çeviri)
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