KMgF_3∶Eu,X(X=Ce,Cr,Gd,Cu)体系中Eu^(2+)振动光谱和共掺离子的格位取代

Vibronic Transitions and Site Substitution of Eu^(2+) and Codoped Ions in KMgF_3∶Eu-X (X=Ce, Cr, Gd, Cu) System

测定了一系列单掺杂 Eu2 +和双掺杂 Eu,X( X=Ce,Cr,Gd,Cu)的 KMg F3晶体在 30 0 K和 77K的高分辨发射光谱以及伴随的振动光谱 ,据此研究了 Eu2 + 在这些体系中的振动跃迁特征 ,并指认了每一振动峰所对应的正则振动模式 .首次发现了在共掺杂体系中 Eu2

The high\|resolution emission spectra of KMgF\-3∶Eu and KMgF\-3∶Eu\|X(X=Ce, Cr, Gd, Cu) single crystals were measured at 300 and 77 K. The vibronic side bands of Eu\+\{2+\} were characterized and an assignment of the normal mode frequencies to particular vibrations has been made. The correlation between the vibronic frequencies of Eu\+\{2+\} and the site substitution of other co\|doped ions was first found. The relationship between vibronic intensity of Eu\+\{2+\} and other doped ions concentration showed that Cr\+\{3+\}, Gd\+\{3+\} ions competed K\++ sites with Eu\+\{2+\} ions. Ce\+\{3+\} and Eu\+\{3+\} occurred the electron transference. The introduction of Cu\++ made for Eu\+\{2+\} substuting for K\++ sites.