Keywords

Displays, fluorescence spectroscopy, luminescence, optical frequency up conversion, optical scattering, rare earth compounds

Abstract

Up-conversion (UC) in rare-earth co-doped fluorides to convert diode laser light in the near infrared to red, green and blue visible light is applied to make possible high performance emissive displays. The infrared-to-visible UC in the materials we study is a sequential form of non-linear two photon absorption in which a strong absorbing constituent absorbs two low energy photons and transfers this energy to another constituent which emits visible light. Some of the UC emitters' most appealing characteristics for displays are: a wide color gamut with very saturated colors, very high brightness operation without damage to the emitters, long lifetimes and efficiencies comparable to those of existing technologies. Other advantages include simplicity of fabrication, versatility of operating modes, and the potential for greatly reduced display weight and depth. Thanks to recent advances in material science and diode laser technology at the excitation wavelength, UC selected materials can be very efficient visible emitters. However, optimal UC efficiencies strongly depend on chosing proper operating conditions. In this thesis, we studied the conditions required for optimization. We demonstrated that high efficiency UC depends on high pump irradiance, low temperature and low scattering. With this understanding we can predict how to optimally use UC emitters in a wide range of applications. In particular, we showed how our very efficient UC emitters can be applied to make full color displays and very efficient white light sources.

Notes

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Graduation Date

2006

Semester

Spring

Advisor

Bass, Michael

Degree

Doctor of Philosophy (Ph.D.)

College

College of Optics and Photonics

Degree Program

Optics

Format

application/pdf

Identifier

CFE0001058

URL

http://purl.fcla.edu/fcla/etd/CFE0001058

Language

English

Length of Campus-only Access

None

Access Status

Doctoral Dissertation (Open Access)

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