Identification of the shallow donor state in Sb doped ZnO by photoluminescence excitation spectroscopy

2018 ◽  
Vol 124 (19) ◽  
pp. 195701 ◽  
Author(s):  
S. P. Watkins ◽  
F. Mohammadbeigi ◽  
K. Stirling ◽  
E. Senthil Kumar
Keyword(s):  
Shallow Donor ◽  
Photoluminescence Excitation ◽  
Doped Zno ◽  
Donor State

Manifestation of the Spin in the Isotope Effects

2015 ◽  
Vol 1084 ◽  
pp. 147-151
Author(s):  
Vladimir G. Plekhanov ◽  
Vyacheslav F. Myshkin ◽  
Valery A. Khan ◽  
Dmitry A. Izhoykin
Keyword(s):  
Magnetic Field ◽  
Transition Energy ◽  
Isotope Effects ◽  
Shallow Donor ◽  
Photoluminescence Excitation ◽  
Isotope Substitution ◽  
Fundamental Properties ◽  
Atomic Nuclei ◽  
Modern Physics ◽  
Band Transition

Modern physics distinguishes three fundamental properties of atomic nuclei: mass; spin and related magnetic moment; volume (surrounding field strength), which are the source of isotope effects. The experiments showed that the isotope substitution of the light isotope with the hard one increased the band-to-band transition energy Eg, as well as the exciton binding energy Ebboth in semiconductors and insulators. The representative manifestation of the spin has been observed in photoluminescence excitation spectroscopy in highly enriched28Si crystals with shallow donor P, as well as in the separation of13C and12С isotope in magnetic field.

Li-Doped ZnO Nanoparticles as Novel Direct Generator of Singlet Oxygen for Potential Photodynamic Therapy Applications

2015 ◽  
Vol 1784 ◽  
Author(s):  
Milton A. Martínez Julca ◽  
Ivonnemary Rivera ◽  
Oscar Perales-Pérez ◽  
Sonia Bailón ◽  
Melina Pérez
Keyword(s):  
Photodynamic Therapy ◽  
Singlet Oxygen ◽  
Zno Nanoparticles ◽  
Band Gap Energy ◽  
Shallow Donor ◽  
Emission Peak ◽  
Ros Generation ◽  
Trap States ◽  
Li Doping ◽  
Doped Zno

ABSTRACTPhotodynamic therapy (PDT) is an alternative to traditional cancer treatments. This approach involves the use of photosensitizer (PS) agents and their interaction with light. As a consequence, cytotoxic reactive oxygen species (ROS) are generated that, in turn will destroy tumors. On the other hand, ZnO is a biocompatible, nontoxic, and biodegradable material with the capability to generate ROS, specifically singlet oxygen (SO), which makes this material a promising candidate for 2-photon PDT. Doping ZnO with Li species is expected to induce defects in the host oxide structure that favors the formation of trap states that should affect the electronic transitions related to the generation of SO. The present work reports the effect of the level of Li-doping on the ZnO structure and its capability to generate SO. Li-doped ZnO nanoparticles were synthesized under size-controlled conditions using a modified version of the polyol method. XRD measurements confirmed the development of well-crystallized ZnO Wurtzite; the average crystallite sizes ranged between 13.3nm and 14.2 nm, with an increase in Li content. The corresponding band gap energy values, estimated from UV-vis measurements, decreased from 3.33 to 3.25 eV. Photoluminescence (PL) measurements of Li-ZnO revealed the presence of emission peaks centered on 363nm, 390nm, and 556 nm; these emission peaks correspond to the exciton emission, transition of shallow donor levels near of the conduction band to valence band such as interstitial Zn, and oxygen vacancies, respectively. The observed increase of the emission intensity of the 390 nm emission peak, relative to the intensity of the main emission peak at 363nm, was attributed to the promote of trap states due to interstitial Zn or Li-incorporation into the host oxide lattice. SO measurements evidenced the enhancing effect of the Li concentration on the capability of the doped ZnO to generate this species. This Li-dependence of SO generation can be attributed to the enhancement of the concentration of trap states in the host ZnO, as suggested by PL measurements. Accordingly, Li-ZnO would become cytotoxic to cancer cells via photo-induced ROS generation enabling this nanomaterial to be considered as a potential direct PS agent for the 2-photon PDT route.

Dielectric relaxation of shallow donor in polycrystalline Mn-doped ZnO

2003 ◽  
Vol 93 (7) ◽  
pp. 4097-4103 ◽  
Author(s):  
Jiaping Han ◽  
A. M. R. Senos ◽  
P. Q. Mantas ◽  
Wenwu Cao
Keyword(s):  
Dielectric Relaxation ◽  
Shallow Donor ◽  
Doped Zno ◽  
Mn Doped

Shallow Donor Ionization Energy in Sn-Doped ZnO Nanobelts

2014 ◽  
Vol 6 (10) ◽  
pp. 887-891 ◽  
Author(s):  
Rui Deng ◽  
Yong-Feng Li ◽  
Bin Yao ◽  
Jie-Ming Qin ◽  
Da-Yong Jiang ◽  
...  
Keyword(s):  
Ionization Energy ◽  
Shallow Donor ◽  
Doped Zno

Control of magneto-transport characteristics of Co-doped ZnO by electron beam irradiation

RSC Advances ◽  
2016 ◽  
Vol 6 (47) ◽  
pp. 41067-41073 ◽  
Author(s):  
Seunghun Lee ◽  
Ji Hun Park ◽  
Won-Kyung Kim ◽  
Hyung Dal Park ◽  
Byung Cheol Lee ◽  
...  
Keyword(s):  
Electron Beam ◽  
Conduction Band ◽  
Electron Beam Irradiation ◽  
Shallow Donor ◽  
Beam Irradiation ◽  
Donor Type ◽  
Doped Zno ◽  
Co Doped

Electron beam irradiation can be used to remove shallow donor type hydrogen located in Zn(Co)–O bonding centers in Co-doped ZnO, which enables to modify the conduction band and the magneto-transport characteristics of Co-doped ZnO.

First-principles supercell calculations for simulating a shallow donor state in Si

2009 ◽  
Vol 373 (43) ◽  
pp. 3989-3993 ◽  
Author(s):  
Takenori Yamamoto ◽  
Tsuyoshi Uda ◽  
Takahiro Yamasaki ◽  
Takahisa Ohno
Keyword(s):  
First Principles ◽  
Shallow Donor ◽  
Donor State

Shallow donor state of hydrogen inIn2O3andSnO2: Implications for conductivity in transparent conducting oxides

2009 ◽  
Vol 80 (8) ◽  
Author(s):  
P. D. C. King ◽  
R. L. Lichti ◽  
Y. G. Celebi ◽  
J. M. Gil ◽  
R. C. Vilão ◽  
...  
Keyword(s):  
Transparent Conducting Oxides ◽  
Shallow Donor ◽  
Conducting Oxides ◽  
Transparent Conducting ◽  
Donor State

Shallow Donor State Due to Nitrogen-Hydrogen Complex in Diamond

2002 ◽  
Vol 88 (6) ◽  
Author(s):  
Takehide Miyazaki ◽  
Hideyo Okushi ◽  
Tsuyoshi Uda
Keyword(s):  
Shallow Donor ◽  
Donor State
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