Effects of the ZnO layer on the structure and white light emission properties of a ZnS:Mn/GaN nanocomposite system

摘要: ZnO films were inserted between the ZnS:Mn and GaN substrates by pulsed laser deposition (PLD). The structure, morphology, optical properties of ZnS:Mn/ZnO/GaN nanocomposite systems have been investigated. X-ray diffraction results show that there are three peaks located at 28.4°, 34.4°, 34.1°, which correspond to β-ZnS(111), ZnO(002), GaN(002) planes, respectively. Due insertion films, peak intensity in is stronger than ZnS:Mn/GaN, full width half-maximum smaller. Though transmittance ZnS:Mn/ZnO slightly lower still higher 80%. Compared with an ultraviolet (UV) emission 387 nm (originated from near-band ZnO) a green light about 520 nm appeared photoluminescence (PL) spectra ZnS:Mn/ZnO/GaN, addition blue 435 nm orange–red 580 nm. may be related deep-level interface ZnS:Mn/ZnO. The PL spectrum covers visible region red (400–700 nm), its color coordinate temperature (0.3103,0.3063) 6869 K, respectively, presenting strong white emission.