{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/70199"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/70199","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"High Pressure Optical and Photoelectrical Studies","abstract":"The effect of high pressures to 40 kilobars and temperatures down to 100(DEGREES)K on the intensity and lifetime of NaCl:Tl('+) and NaCl:In('+) has been studied. A kinetic model describing these phosphors has been presented. The excited ('3)T(,lu) state is radiatively and nonradiatively coupled to the ground state, ('3)A(,lg). The radiative rate increases with increasing pressure due to an increase of the spin orbit coupling. The nonradiative rate is not pressure sensitive. The ('3)T(,lu) state is in thermal equilibrium with the ('3)A(,lu) level below it. For NaCl:Tl('+) the energy separating the minima of the ('3)T(,lu) and ('3)A(,lu) was found to be 22.7 meV and was too small to be measured for NaCl:In. Pressure did not effect the thermal energy difference. It was found that the nonradiative rate, k(,nrT), increased with decreasing temperature decreasing the quantum yield.","abstract_html":"The effect of high pressures to 40 kilobars and temperatures down to 100(DEGREES)K on the intensity and lifetime of NaCl:Tl('+) and NaCl:In('+) has been studied. A kinetic model describing these phosphors has been presented. The excited ('3)T(,lu) state is radiatively and nonradiatively coupled to the ground state, ('3)A(,lg). The radiative rate increases with increasing pressure due to an increase of the spin orbit coupling. The nonradiative rate is not pressure sensitive. The ('3)T(,lu) state is in thermal equilibrium with the ('3)A(,lu) level below it. For NaCl:Tl('+) the energy separating the minima of the ('3)T(,lu) and ('3)A(,lu) was found to be 22.7 meV and was too small to be measured for NaCl:In. Pressure did not effect the thermal energy difference. It was found that the nonradiative rate, k(,nrT), increased with decreasing temperature decreasing the quantum yield.","abstract_has_math":false,"creators":["Littman, Jon Eric"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-15T23:17:46Z","date_published":"2014-12-15T23:17:46Z","updated_at":"2026-07-22T22:26:02Z","subjects":["Chemistry, Physical"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8302922"],"render_values":[{"text":"(UMI)AAI8302922","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/70199","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Littman, Jon Eric"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-15T23:17:46Z","10000-01-01","1982"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Chemistry, Physical"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/70199","(UMI)AAI8302922"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The effect of high pressures to 40 kilobars and temperatures down to 100(DEGREES)K on the intensity and lifetime of NaCl:Tl('+) and NaCl:In('+) has been studied. A kinetic model describing these phosphors has been presented. The excited ('3)T(,lu) state is radiatively and nonradiatively coupled to the ground state, ('3)A(,lg). The radiative rate increases with increasing pressure due to an increase of the spin orbit coupling. The nonradiative rate is not pressure sensitive. The ('3)T(,lu) state is in thermal equilibrium with the ('3)A(,lu) level below it. For NaCl:Tl('+) the energy separating the minima of the ('3)T(,lu) and ('3)A(,lu) was found to be 22.7 meV and was too small to be measured for NaCl:In. Pressure did not effect the thermal energy difference. It was found that the nonradiative rate, k(,nrT), increased with decreasing temperature decreasing the quantum yield.","The effect of pressure to 10 kilobars at 300 K on the relative flatband potential of n and p type InP in aqueous 2Te('2-)/Te(,2)('2-) and V('+2)/V('+3) electrolytes respectively was studied. This work presents a novel way to measure experimentally the effect of pressure on the bottom of the conduction band and the top of the valence band independently of one another. It was determined that the increases of the energy gap of the direct transition of InP, 8.5 meV/kbar, is to first order due to the movement of the conduction band.","Made available in DSpace on 2014-12-15T23:17:46Z (GMT). No. of bitstreams: 1 8302922.pdf: 2599751 bytes, checksum: b137edfa6c2aeed05b38e542dcfaed20 (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 70365 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","96 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."]},{"key":"dc:title","label":"Title","values":["High Pressure Optical and Photoelectrical Studies"]}]}],"canonical_facts":{"dc:creator":["Littman, Jon Eric"],"dc:date":["2014-12-15T23:17:46Z","10000-01-01","1982"],"dc:description":["The effect of high pressures to 40 kilobars and temperatures down to 100(DEGREES)K on the intensity and lifetime of NaCl:Tl('+) and NaCl:In('+) has been studied. A kinetic model describing these phosphors has been presented. The excited ('3)T(,lu) state is radiatively and nonradiatively coupled to the ground state, ('3)A(,lg). The radiative rate increases with increasing pressure due to an increase of the spin orbit coupling. The nonradiative rate is not pressure sensitive. The ('3)T(,lu) state is in thermal equilibrium with the ('3)A(,lu) level below it. For NaCl:Tl('+) the energy separating the minima of the ('3)T(,lu) and ('3)A(,lu) was found to be 22.7 meV and was too small to be measured for NaCl:In. Pressure did not effect the thermal energy difference. It was found that the nonradiative rate, k(,nrT), increased with decreasing temperature decreasing the quantum yield.","The effect of pressure to 10 kilobars at 300 K on the relative flatband potential of n and p type InP in aqueous 2Te('2-)/Te(,2)('2-) and V('+2)/V('+3) electrolytes respectively was studied. This work presents a novel way to measure experimentally the effect of pressure on the bottom of the conduction band and the top of the valence band independently of one another. It was determined that the increases of the energy gap of the direct transition of InP, 8.5 meV/kbar, is to first order due to the movement of the conduction band.","Made available in DSpace on 2014-12-15T23:17:46Z (GMT). No. of bitstreams: 1 8302922.pdf: 2599751 bytes, checksum: b137edfa6c2aeed05b38e542dcfaed20 (MD5) Previous issue date: 1982","Embargo set by: Seth Robbins for item 70365 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","96 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1982."],"dc:identifier":["http://hdl.handle.net/2142/70199","(UMI)AAI8302922"],"dc:subject":["Chemistry, Physical"],"dc:title":["High Pressure Optical and Photoelectrical Studies"],"dc:type":["text"],"thesis:degree_discipline":["Chemistry"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:02Z"}