White Light Upconversion Emissions

White Light Upconversion Emissions from Tm 3+ + Ho 3+ + Yb 3+ Codoped Tellurite and Germanate Glasses on Excitation with 798 nm Radiation [Giri et. al., Journal of Applied Physics 104 , 113107 (2008)] MSE 576 Thin Films & Analysis Presentation Deepak Rajput Graduate Research Assistant Center for Laser Applications University of Tennessee Space Institute Tullahoma, Tennessee 37388-9700 Email: [email_address] Web: http://drajput.com

Outline ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction: General ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Introduction: Inspiration ,[object Object],RGB figures drawn by IR pump lasers. Downing et al , Science 273, 1185 (1996),

Introduction: contd.. ,[object Object],[object Object],[object Object],[object Object]

Experimental ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Experimental ..contd ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Results and Discussion: Absorption Spectra ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Optical absorption spectra of 0.6 mol% Ho 3+ + 0.5 mol % Tm 3+ + 2.0 mol % Yb 3+ UV Visible NIR

Results and Discussion: Fluorescence Spectra ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Downconversion spectrum of 0.6 mol % Ho 3+ + 0.5 mol % Tm 3+ + 2.0 mol % Yb 3+ codoped tellurite and germanate glasses on 363 nm excitation. 1) 5 G 4 -> 5 I 8 Ho 3+ , 2) 5 G 5 -> 5 I 8 Ho 3+ , 3) 1 D 2 -> 3 F 4 Tm 3+ , 4) 1 G 4 -> 3 H 6 Tm 3+ , 5) 5 G 4 -> 5 I 7 Ho 3+ , 6) 5 F 4 ( 5 S 2 )-> 5 I 8 Ho 3+ , and 7) 5 G 4 -> 5 I 6 Ho 3+ in both cases. Tellurite glass Germanate glass

Results and Discussion: Fluorescence Spectra Energy level scheme of Ho 3+ +Tm 3+ ions. The fluorescence emission transitions in case of downconversion are indicated by arrow. 5 G 4 Ho 3+ 1 D 2 Tm 3+

Results and Discussion: Excitation Spectra ,[object Object],[object Object],[object Object],[object Object],[object Object],Excitation spectrum with emission at 547 nm of the 0.6 mol % Ho 3+ + 0.5 mol % Tm 3+ + 2.0 mol % Yb 3+ codoped tellurite and germanate glasses.

Results and Discussion: Upconversion ,[object Object],[object Object],[object Object],[object Object],[object Object],* Giri et al , Journal of Applied Physics 101 , 033102 (2007).

Results and Discussion: Upconversion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Results and Discussion: Upconversion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Upconversion spectra of Ho 3+ +Tm 3+ +Yb 3+ codoped tellurite glass on 798 nm excitation.

Results and Discussion: Upconversion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Results and Discussion: Mechanism ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Results and Discussion: Mechanism Energy level and mechanism involved in upconversion process.

Results and Discussion: Mechanism ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

White Light Upconversion Emissions

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White Light Upconversion Emissions