Lead bromide and ternary alkali lead bromide single crystals — growth and emission properties

✍ Scribed by K. Nitsch; V. Hamplová; M. Nikl; K. Polák; M. Rodová

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 415 KB
• Volume: 258
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)00665-3

✦ Synopsis

Single crystals of PbBr 2, RbPb2Br 5 and CsPbBr 3 (20 mm in diameter and 50 mm long) were grown by the Bridgman method from starting materials purified by bromination with bromine and hydrogen bromide and by zone refining and were tested by measurements of the low-temperature exciton luminescence and decay kinetics. The emission of RbPb2Br 5 resembles that of PbBr~. Short (10-20 ps) decay times were found in CsPbBr 3. The emission of all compounds tested is strongly influenced by defects and the exciton character changes from Frenkel to Wannier type going from PbBr 2 to CsPbBr 3.