Some New Luminescent Compounds Based on 4-Methylbenzylamine and Lead Halides

Abstract

Compounds of the general formula (CH 3 NH 3 ) n 1 (CH 3 C 6 H 4 CH 2 NH 3 ) 2 Pb n X 3n+1 , where X = I, Br, Cl and n = 1, 2, 3,..., were prepared and characterized analytically and spectroscopically. Moreover, (CH 3 C 6 H 4 CH 2 NH 3 ) 2 PbX 4 and (CH 3 NH 3 )(CH 3 C 6 H 4 CH 2 NH 3 ) 2 Pb 2 I 7 were characterized by X-ray crystal structure analysis. Their optical absorption and photoluminescence spectra exhibit excitonic bands, even at room temperature.

Some Organic-Inorganic Hybrid Semiconductors Obtained from Melts

“…:3) obtained from melts exhibit weak OA bands at ca 473-512 nm and strong PL bands at ca 504 -518 nm, as in the cases of compounds obtained from solutions [10,13].…”

“…Only, the ambient conditions OA, PL, PLE and PC spectra were recorded by instrumentation described elsewhere [13]. The spectra were found to be identical to the corresponding spectra of thin films obtained from solutions (see [10,12,13]). However, the excitonic PC bands of samples obtained from melts were found to be more intense and sharper than those obtained from solutions.…”

“…There is only little information on properties of hybrid compounds obtained from melts [12]. Very recently, a number of compounds have been prepared from melts and characterized crystallographically [15] In this paper, the sample preparation of these compounds from melts as well as their optical absorption (OA), photoluminescence (PL), photoluminescence excitation (PLE) and photoconductivity (PC) spectra are described. The results are compared to those obtained from solutions.…”

“…Consequently, an alternative method, i.e., that from melts, could be applied for the construction of optoelectronic devices [15]. By this method, instead of that from solutions, the problems arising from pinholes and exclusive solvents could be avoided [15].…”

Induced absorption and spontaneous emission due to biexciton in two-dimensional semiconductor (CH3C6H4CH2NH3)2PbBr4 single crystal

“…Details on the crystal growth and room temperature optical properties have been reported by Papavassiliou et al [8]. It consists of a well layer of two-dimensional network of PbBr 6 octahedrons and a barrier layer of 4-methybenzylamine (CH 3 C 6 H 4 CH 2 NH 3 ) [8].…”