Large quadratic interaction for the coexistence of two kinds of Jahn-Teller distortions in KI:T1-type phosphors期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Large quadratic interaction for the coexistence of two kinds of Jahn-Teller distortions in KI:T1-type phosphors

Authors:	A Ranfagni GP Pazzi P Fabeni G Viliani MP Fontana

Institution:	Instituto di Ricerca sulle Onde Elettromagnetiche del Consiglio Nazionale delle Ricerche, Firenza, Italy;Instituto di Fisica Superiore dell''Università di Firenze, Firenze, Italy;Instituto di Fisica dell''Università di Parma, Parma, Italy

Abstract:	A modified Fukuda model, which is based on the coexistence of T¹ tetragonal and X rhombic minima on the ³T¹_1u energy levels due to Jahn-Teller effect, is tested by means of the available experimental data concerning absorption and emission bands positions and the electron-lattice coupling constant for E_g modes. The model is satisfactory only if a strong difference in curvature between the ground and excited levels $(β ? 0.75)$ is assumed; this suggests that second order Jahn-Teller effect terms may be important.

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