Zhao Xinwei, Zheng Ting, Zhao Weiwei, Yu Yuanfang, Wang Wenhui, Ni Zhenhua
School of Physics, Southeast University, Nanjing 211189, China.
Nanomaterials (Basel). 2023 Jan 31;13(3):571. doi: 10.3390/nano13030571.
The intrinsic chaotic phase distribution in Ruddlesden-Popper Perovskite (RPP) hinders its further improvement of photoluminescence (PL) emission and limits its application in optical devices. In this work, we achieve the phase distribution regulation of RPP by varying the composition ratio of organic bulky spacer cations 1-naphthylmethylamine (NMA) and phenylethyl-ammonium (PEA), which is controllable and nondestructive for structures of RPP. By suppressing the small n-phase, the PL intensity emission of RPP is further improved. Through the time-resolved PL (TRPL) measurements, we find the PL lifetime of the sample with 66% PEA concentration increases with the temperature initially and possesses the highest values of τ1 and τ2 at ~255 K, indicating the immediate state assisting exciton radiative recombination, and it can be modulated by phase manipulation in RPP. The immediate state may outcompete other non-radiative decay channels for excited carriers, leading to the PL enhancement in RPP, and broadening its further application.
Ruddlesden-Popper钙钛矿（RPP）中固有的混沌相分布阻碍了其光致发光（PL）发射的进一步改善，并限制了其在光学器件中的应用。在这项工作中，我们通过改变有机大体积间隔阳离子1-萘甲胺（NMA）和苯乙铵（PEA）的组成比来实现RPP的相分布调控，这对RPP的结构是可控且无损的。通过抑制小n相，RPP的PL发射强度得到进一步提高。通过时间分辨PL（TRPL）测量，我们发现PEA浓度为66%的样品的PL寿命最初随温度增加，并在~255 K时具有最高的τ1和τ2值，表明即时态有助于激子辐射复合，并且它可以通过RPP中的相操纵进行调制。即时态可能比其他非辐射衰变通道更能竞争激发载流子，导致RPP中的PL增强，并拓宽其进一步应用。
