Optical band gap studies on lithium aluminum silicate glasses doped with Cr3+ ions

被引:120
作者
El-Diasty, Fouad [1 ]
Wahab, Fathy A. Abdel
Abdel-Baki, Manal
机构
[1] Ain Shams Univ, Fac Sci, Cairo 11566, Egypt
[2] Natl Res Ctr, Glass Dept, Giza 12311, Egypt
关键词
D O I
10.1063/1.2362926
中图分类号
O59 [应用物理学];
学科分类号
摘要
Lithium aluminum silicate glass system (LAS) implanted with chromium ions is prepared. The reflectance and transmittance measurements are used to determine the dispersion of absorption coefficient. The optical data are explained in terms of the different oxidation states adopted by the chromium ions into the glass network. It is found that the oxidation state of the chromium depends on its concentration. Across a wide spectral range, 0.2-1.6 mu m, analysis of the fundamental absorption edge provides values for the average energy band gaps for allowed direct and indirect transitions. The optical absorption coefficient just below the absorption edge varies exponentially with photon energy indicating the presence of Urbach's tail. Such tail is decreased with the increase of the chromium dopant. From the analysis of the optical absorption data, the absorption peak at ground state exciton energy, the absorption at band gap, and the free exciton binding energy are determined. The extinction coefficient data are used to determine the Fermi energy level of the studied glasses. The metallization criterion is obtained and discussed exploring the nature of the glasses. The measured IR spectra of the different glasses are used to throw some light on the optical properties of the present glasses correlating them with their structure and composition. (c) 2006 American Institute of Physics.
引用
收藏
页数:7
相关论文
共 44 条
[1]   Urbach-Martienssen's tails in layered semiconductor GaSe [J].
Abay, B ;
Güder, HS ;
Yogurtçu, YK .
SOLID STATE COMMUNICATIONS, 1999, 112 (09) :489-494
[2]   Optical characterization of xTiO2-(60-x)SiO2-40Na2O glasses I.: Linear and nonlinear dispersion properties [J].
Abdel-Baki, M ;
Wahab, FAA ;
El-Diasty, F .
MATERIALS CHEMISTRY AND PHYSICS, 2006, 96 (2-3) :201-210
[3]   Study of chromium states in silica glass implanted with Cr+ ions to high fluences [J].
Aboukaïs, A ;
Bogomolova, LD ;
Cattaruzza, E ;
Deshkovskaya, AA ;
Krasil'nikova, NA ;
Prushinsky, SA ;
Zhilinskaya, EA .
OPTICAL MATERIALS, 2003, 22 (03) :177-185
[4]  
[Anonymous], 1994, INTRO ELECT PROPERTI
[5]  
[Anonymous], 2022, INFRARED SPECTRA MIN, DOI DOI 10.1180/MONO-4.16
[6]   Oxidation state and local coordination of chromium dopant in soda-lime-silicate and calcium-aluminate glasses [J].
Choi, YG ;
Kim, KH ;
Han, YS ;
Heo, J .
CHEMICAL PHYSICS LETTERS, 2000, 329 (5-6) :370-376
[7]   DISORDER AND THE OPTICAL-ABSORPTION EDGE OF HYDROGENATED AMORPHOUS-SILICON [J].
CODY, GD ;
TIEDJE, T ;
ABELES, B ;
BROOKS, B ;
GOLDSTEIN, Y .
PHYSICAL REVIEW LETTERS, 1981, 47 (20) :1480-1483
[8]   CONDUCTION IN NON-CRYSTALLINE SYSTEMS .5. CONDUCTIVITY, OPTICAL ABSORPTION AND PHOTOCONDUCTIVITY IN AMORPHOUS SEMICONDUCTORS [J].
DAVIS, EA ;
MOTT, NF .
PHILOSOPHICAL MAGAZINE, 1970, 22 (179) :903-&
[9]   IR AND OPTICAL-PROPERTIES OF PBO GLASS CONTAINING A SMALL AMOUNT OF SILICA [J].
DAYANAND, C ;
BHIKSHAMAIAH, G ;
SALAGRAM, M .
MATERIALS LETTERS, 1995, 23 (4-6) :309-315
[10]   Electronic polarizability, optical basicity and non-linear optical properties of oxide glasses [J].
Dimitrov, V ;
Komatsu, T .
JOURNAL OF NON-CRYSTALLINE SOLIDS, 1999, 249 (2-3) :160-179