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▲ [21a-231C-4] Triplet excitation and transferring in thin film generated by electron injection process
Keywords:triplet, transfer, Dexter transfer
Triplet excitons play an important role in phosphorescent organic light-emitting diode, and some interesting characteristics of triplet excitons was also well studied. Dexter triplet electron transfer is one of these special characteristics which is expected to be an application to signal delivery field. Triplet transfer is usually accompanied with triplet-triplet annihilation (TTA), and this phenomenon indicates two triplet excitons meet each other and one become higher energetic singlet state and one go back to ground state. However, in this research, the main purpose is to build a triplet transfer system which keep excitons in triplet state which is available to mimic signal delivery. The concept of this research is in Fig.1. Triplet excitons are generated by applying voltage, transferring to another terminal being detected, and the whole process keeps in triplet state situation.
The sample structure is in Fig. 2. The organic molecule is Ir(ppy)3 which is a high quantum efficiency green phosphorescent material, providing triplet source, and Ir(ppy)3 is also reported that Dexter-type transfer would occur. Therefore, Ir(ppy)3 is chosen to be organic layer. The measurement schematic is in Fig. 3. Electron injection process is carried out by applying voltage with probe to sample, and the triplet exctions are detected by photomultiplier and oscilloscope.
The result shows in Fig 4. It shows that photon number is positively correlated to tunneling current. The next step is to get ordered structure of organic molecule in order to increase triplet transferring chance.
The sample structure is in Fig. 2. The organic molecule is Ir(ppy)3 which is a high quantum efficiency green phosphorescent material, providing triplet source, and Ir(ppy)3 is also reported that Dexter-type transfer would occur. Therefore, Ir(ppy)3 is chosen to be organic layer. The measurement schematic is in Fig. 3. Electron injection process is carried out by applying voltage with probe to sample, and the triplet exctions are detected by photomultiplier and oscilloscope.
The result shows in Fig 4. It shows that photon number is positively correlated to tunneling current. The next step is to get ordered structure of organic molecule in order to increase triplet transferring chance.