| 1. |
- Andersson, Mats R., et al.
(författare)
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Electroluminescence from Substituted Poly(thiophenes) : From Blue to Near-Infrared
- 1995
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Ingår i: Macromolecules. - : American Chemical Society. - 0024-9297 .- 1520-5835. ; 28:22, s. 7525-7529
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Tidskriftsartikel (refereegranskat)abstract
- We report a systematic approach to the control of the conjugation length along the poly(thiophene) backbone. The planarity of the main chain can be permanently modified by altering the pattern of substitution and character of the substituents on the poly(thiophene) chain, and the conjugation length is thus modified. We obtain blue, green, orange, red, and near-infrared electroluminescence from four chemically distinct poly(thiophenes). The external quantum efficiencies are in the range of 0.01-0.6%.
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| 2. |
- Karlsson, Bengt, et al.
(författare)
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Thyroid dysfunction in Down's syndrome : relation to age and thyroid autoimmunity
- 1998
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Ingår i: Archives of Disease in Childhood. - 0003-9888 .- 1468-2044. ; 79:3, s. 242-245
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: The prevalence of thyroid disease is increased in Down's syndrome. Most available data come from cross sectional studies. AIMS: To study longitudinally thyroid function in patients with Down's syndrome in Uppsala county (85 patients) up to the age of 25 years. METHODS: Observational study based on yearly follow up in a children's clinic. Thyroid function tests were performed at each visit to the clinic. RESULTS: Hypothyroidism was found in 30 and hyperthyroidism was found in two of the 85 patients. No sex difference was seen. Half of the patients with hypothyroidism acquired the condition before the age of 8 years, but only one of them displayed thyroid autoantibodies at diagnosis. Most patients who developed hypothyroidism after this age had thyroid autoantibodies. In the prepubertal patients with hypothyroidism, growth velocity was lower during the year before the start of thyroxine treatment than during the year after treatment began; it was also lower than that of sex and age matched euthyroidic children with Down's syndrome. CONCLUSION: Thyroid dysfunction in patients with Down's syndrome is common in childhood. Consequently, annual screening is important. Autoimmune thyroid disease is uncommon in young children with Down's syndrome but is common after 8 years of age.
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| 3. |
- Andersson, Mats R., et al.
(författare)
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Synthesis of poly(alkylthiophenes) for light-emitting diodes
- 1995
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Ingår i: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 71:1-3, s. 2183-2184
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Tidskriftsartikel (refereegranskat)abstract
- We have demonstrated a general way to tune the emission of poly(alkylthiophenes) by using steric interaction between the repeating units. Light-emitting diodes prepared of the polymers have blue to near-infrared emission.
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| 4. |
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| 5. |
- Berggren, Magnus, et al.
(författare)
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Controlling colour by voltage in polymer light emitting diodes
- 1995
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Ingår i: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 71:1-3, s. 2185-2186
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Tidskriftsartikel (refereegranskat)abstract
- We report electroluminescence using different substituted polythiophenes as the emitting mterial. Different substituents cause different sterical interacion which force the thiophene rings out of planarity. This results in different bandgaps. Colours from blue to near infrared have been demonstrated in electroluminescent devices. We also demonstrate voltage controlled electroluminescence using mixtures of these polymers.
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| 6. |
- Berggren, Magnus, et al.
(författare)
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Polymer light-emitting diodes placed in microcavities
- 1996
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Ingår i: Synthetic metals. - : Elsevier. - 0379-6779 .- 1879-3290. ; 76:1-3, s. 121-123
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Tidskriftsartikel (refereegranskat)abstract
- The use of resonant optical microcavities to influence the emission properties of conjugated polymer light-emitting diodes (LEDs) is reported. The microcavities, which are built using metallic mirrors and polymeric spacers, incorporate polymer LEDs in between the mirrors. We report experimental results of polymer LEDs based on substituted polythiophenes. The effects include substantial narrowing of the spectral width of the emitted light, enhancement of the emission at the microcavity resonance, and coupling of two emission processes to different resonance modes in the same cavity.
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| 7. |
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| 8. |
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| 9. |
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| 10. |
- Gustafsson, Jonas, et al.
(författare)
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A defective swelling lamellar phase
- 1997
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Ingår i: LANGMUIR. - : AMER CHEMICAL SOC. - 0743-7463. ; 13:4, s. 852-860
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Tidskriftsartikel (refereegranskat)abstract
- The phase equilibria in mixtures of egg lecithin and cetyltrimethylammonium chloride in brine (100 mM sodium chloride) were studied with particular emphasis on the behavior of the lamellar phase. The solvent corner of this pseudoternary system features an
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