Predicting and modeling the low-voltage cathodoluminescent efficiency of oxide phosphors
- Univ. of California, San Diego, La Jolla, CA (United States)
- Sandia National Labs., Albuquerque, NM (United States)
A novel ceramic synthesis technique, combustion synthesis, was used to produce submicron-sized Y{sub 2}O{sub 3}:Eu{sup 3+} phosphors. This technique exploits the exothermic redox reaction of yttrium and europium nitrates (oxidizers) with urea (CH{sub 4}N{sub 2}O) fuel (reducing agent). Resulting powders were luminescent in the as-synthesized state. However, their luminous intensity increased with increasing postreaction annealing treatments (1,000--1,600 C for 2 h). The low-voltage (200--1,000 V) cathodoluminescence efficiency of Y{sub 2}O{sub 3}:Eu{sup 3+} was found to increase with increasing crystallite size, independent of the particle size. A model of low-voltage cathodoluminescence that includes the effects of the crystallite size, the probability of radiative recombination, and the effect of surface-bound electrons was developed to predict phosphor efficiency at low voltages. The efficiencies predicted by the model are in very good agreement with experimental results.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 659121
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 9 Vol. 145; ISSN JESOAN; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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