Luminescence of doped nanocrystalline ZnSe

Abstract

Luminescence of nanocrystalline ZnSe:Mn 2+ and ZnSe:Cu 2+ prepared via an organic chemical synthesis method are described. The spectra show distinct ZnSe, Mn 2+ and Cu 2+ related emissions, all of which are excited via the host lattice. The Mn 2+ emission wavelength depends on the concentration of Mn 2+ incorporated into the ZnSe lattice, which is attributed to the presence of Mn 2+ pair-states at higher concentrations. The ZnSe:Cu 2+ luminescence was studied as a function of the crystal-size. Temperature-dependent photoluminescence spectra and photoluminescence lifetime measurements are also presented and the results are compared to those of Mn 2+ and Cu 2+ in bulk ZnSe.

Optical properties of Cu ions‐doped ZnSe quantum dots in silicate glasses

“…It is known that the band gap energy of ZnSe increases with decreasing the temperature . When temperature decreases from 250 to 5 K, energy gap between the conduction band of ZnSe QDs and hole trapping Cu‐state level enlarges, leading to the blue‐shift (from 515 to 494 nm) of the broad band emission from copper ions, consistent with those reported previously . It has to be noted that these broad band emission are from copper ions, since the band‐edge emission was almost completely quenched by energy transfer for glasses heavily doped with copper ions (Figure ).…”

Photoluminescent properties of Ba2ZnS3:Mn phosphors

“…Among many semiconductors, wide band gap II-IV compounds such as zinc chalcogenide ZnS [1][2][3] and ZnSe [4][5][6] and alkaline-earth chalcogenide MgS [7][8][9], CaS [10][11][12], SrS [13][14][15] and BaS [16][17][18] doped with activated emission centers are well known to be efficient luminescent materials for the realization of multicolor electroluminescent and cathodoluminescent devices. For emission centers, the transition metal ions and rare-earth ions are found to be suitable.…”

Doped Semiconductor-Nanocrystal Emitters with Optimal Photoluminescence Decay Dynamics in Microsecond to Millisecond Range: Synthesis and Applications

“… 3 , 6 Opposite to optically allowed exciton emission, dopant emission usually involves optically forbidden transitions of d orbitals of transition metal. 7 , 8 As a result, the typical photoluminescence (PL) decay lifetime for exciton emission is on the order of several tens of nanoseconds, 9 which is beneficial for applications requiring “nanofluorophores”. Conversely, the PL decay lifetime of the dopant emission is in the range between microseconds and milliseconds, 7 , 10 − 13 which fits those applications requiring “nanophosphors”.…”

“… 7 , 8 As a result, the typical photoluminescence (PL) decay lifetime for exciton emission is on the order of several tens of nanoseconds, 9 which is beneficial for applications requiring “nanofluorophores”. Conversely, the PL decay lifetime of the dopant emission is in the range between microseconds and milliseconds, 7 , 10 − 13 which fits those applications requiring “nanophosphors”. Finally, transition metal dopants are often magnetically active, which offers unique magneto-optical properties to d-dots.…”