Objective
This project aims to develop powder materials (phosphors) with homogeneous ultra fine particle sizes for very high resolution Cathode Ray Tubes (CRTs). These tubes will have significant advantages in brightness, stability, and optical clarity over those currently available. This will bring the European research consortium up and beyond the forefront of this technology.
Freeze-dried powders from the acetate, citrate and sol-gel process calcined in the presence of flux was identical to commercial materials with standard grain size.
For aerosol techniques pneumatic atomisation produced polydispersed samples that resulted in agglomerated powders on calcination. Aerosol generation using pneumatic and ultrasonic atomisation showed considerable promise for preparation of complex phosphor powders with a particle size distribution around 2 um. But although these powders exhibited some powder aggregation on high-temperature calcination they show very low saturation at high current densities.
However by using solvothermal crystallisation the formation of a pure and crystalline garnet-type phase required up to 1000 bars at 500 C. Nearly spherical phosphor particles with diameters from 0.5 to 2.5 um could be prepared. Efficiency and resolution in CRT are good but due to the small particle size agglomeration occurs and the screen uniformity is low.
With solid state reactions the particles are not so close to the spherical shape and the grain size distributions are higher although agglomerates are negligible. Small particle size allows a significant improvement of phosphor screen uniformity and an important decrease of size and numbers of blemishes which results in a better signal to noise ratio of the tube. Luminance and resolution give an improved compromise compared with standard corse grain phosphors or fine jet-milled ones. Saturation is higher than for phosphors from aerosol or solvothermal processes.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
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Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
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Coordinator
3016 SEELZE
Germany
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.