Exploring Orbit-Orbit Interaction in Relationship to Photoluminescence Quantum Efficiency in Perovskite Quantum Dots through Rashba Effect
Xu, H; Prabhakaran, P; Choi, S; Wang, M; Lee, KS; Hu, B
| HERO ID | 6322292 |
|---|---|
| In Press | No |
| Year | 2020 |
| Title | Exploring Orbit-Orbit Interaction in Relationship to Photoluminescence Quantum Efficiency in Perovskite Quantum Dots through Rashba Effect |
| Authors | Xu, H; Prabhakaran, P; Choi, S; Wang, M; Lee, KS; Hu, B |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 11 |
| Issue | 1 |
| Page Numbers | 1-6 |
| Abstract | This study demonstrates the influence of the orbit-orbit interaction on the photoluminescence quantum efficiency (PLQE) of metal halide perovskite quantum dots (QDs) through the Rashba effect. The orbit-orbit interaction between excitons was characterized by using the minimal excitation intensity required to generate a photoluminescence difference (ΔPL) between linearly and circularly polarized photoexcitations. It was observed that changing the surface functionalization from PFOA-OA to PFSH-OAm and OA can largely increase the minimal excitation intensity for generating ΔPL. This indicates that the orbit-orbit interaction is essentially decreased in CsPbBr1I2 QDs with surface functionalization. Simultaneously, the PLQE is increased from 39% to 59 and 72% in CsPbBr1I2 QDs upon surface functionalization. Furthermore, the PL lifetime is decreased with increasing the PLQE in CsPbBr1I2 QDs upon surface functionalization. This phenomenon implies that decreasing the orbit-orbit interaction can essentially weaken the Rashba effect and consequently reduce the disallowed transitions, leading to an enhancement in the PLQE in perovskite QDs. |
| Doi | 10.1021/acs.jpclett.9b02936 |
| Pmid | 31794224 |
| Wosid | WOS:000506088000001 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |