Compositional variations in optical characteristics of Mn doped spinel crystals

Compositional Variation of X-ray Excited Optical Luminescence from Mn Doped MgAl2O4

“…Deep yellow or brown colors of crystals grown in O 2 -Ar atmosphere are caused by broad optical absorption around 500 nm. 19 This braod optical absorption may be due to oxidized Mn ions in O 2 -Ar atmosphere. Weak X-ray excited luminescence intensity in the crystal with x = 0.2 is thought to be due to Al 2 O 3 phase including in the crystal.…”

“…Although pale green Mn doped crystal was grown under reduced atmospheres (in pure Ar), crystals in various colors were grown under oxidized (in O 2 -Ar) atmosphere. 19 Crystals in pale red color were grown from Mg deficient compositions, x, from 0.2 to 0.9 in O 2 -Ar atmospheres. Crystals in pale yellow were grown from stoichiometric composition, x = 1.0.…”

“…[15][16][17] PL properties of Mn doped spinel crystal are also found to be influenced by crystal composition. 18,19 Compositional variation of X-ray excited luminescence from Mn doped spinel crystal must, therefore, be studied for X-ray phosphor applications.…”

Red Photoluminescence from Fe-Doped MgAl2O4 Crystals

“…Phase-diagrams at both regions are listed together by Levin et al 7 While MgAl 2 O 4 crystals are excellent substrates for impurity-doped phosphors, challenges persist concerning their composition, electric charges of impurities, and crystal sites. [1][2][3][4][8][9][10][11][12][13][14][15][16][17][18][19][20] Many studies have delved into the properties of phosphors, such as Cr-doped MgAl 2 O 4 , [9][10][11][12] Ti-doped MgAl 2 O 4 , [13][14][15][16] and Mn-doped MgAl 2 O 4 . [17][18][19][20] However, few reports exist on crystal growth and comprehensive assessment of PL from Fe-doped MgAl 2 O 4 .…”

“…[1][2][3][4][8][9][10][11][12][13][14][15][16][17][18][19][20] Many studies have delved into the properties of phosphors, such as Cr-doped MgAl 2 O 4 , [9][10][11][12] Ti-doped MgAl 2 O 4 , [13][14][15][16] and Mn-doped MgAl 2 O 4 . [17][18][19][20] However, few reports exist on crystal growth and comprehensive assessment of PL from Fe-doped MgAl 2 O 4 .…”