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| 1 | Quenching of the red Mn^(4+) luminescence in Mn^(4+)-doped fluoride LED phosphors显示文摘Red-emitting Mn^(4+)-doped fluorides are a promising class of materials to improve the color rendering and luminous efficacy of white light-emitting diodes(w-LEDs).For w-LEDs,the luminescence quenching temperature is very important,but surprisingly no systematic research has been conducted to understand the mechanism for thermal quenching in Mn^(4+)-doped fluorides.Furthermore,concentration quenching of the Mn^(4+) luminescence can be an issue but detailed investigations are lacking.In this work,we study thermal quenching and concentration quenching in Mn^(4+)-doped fluorides by measuring luminescence spectra and decay curves of K2TiF6:Mn^(4+) between 4 and 600 K and for Mn^(4+) concentrations from 0.01%to 15.7%.Temperature-dependent measurements on K2TiF6:Mn^(4+) and other Mn^(4+)-doped phosphors show that quenching occurs through thermally activated crossover between the ^(4)T_(2) excited state and ^(4)A_(2) ground state.The quenching temperature can be optimized by designing host lattices in which Mn^(4+) has a high 4T2 state energy.Concentration-dependent studies reveal that concentration quenching effects are limited in K_(2)TiF_(6):Mn^(4+)up to 5%Mn^(4+).This is important,as high Mn^(4+)concentrations are required for sufficient absorption of blue LED light in the parity-forbidden Mn^(4+)d–d transitions.At even higher Mn^(4+) concentrations(>10%),the quantum efficiency decreases,mostly due to direct energy transfer to quenching sites(defects and impurity ions).Optimization of the synthesis to reduce quenchers is crucial for developing more efficient highly absorbing Mn^(4+) phosphors.The present systematic study provides detailed insights into temperature and concentration quenching of Mn^(4+) emission and can be used to realize superior narrow-band red Mn^(4+) phosphors for w-LEDs. | Tim Senden Relinde J.A.van Dijk-Moes Andries Meijerink | 2018 | Light(Science & Applications)2018，7，1： | 13 |
| 2 | Soft law,self-regulation and co-regulationin European law:where do they meet显示文摘 | Senden L | 2005 | ElectronicJournal of Comparative law2005，9，1： | 1 |
| 3 | Conversion of natural gas to transportation fuels via the Shell Middle Distillate Synthesis process (SMDS) 显示文摘 | Sie S T Senden M M G Van Wechem H M H | 1991 | Catalysis Today1991，8，3： | 1 |
| 4 | Atomic force microscopy imaging of DNA-cationic liposome Complexes optimised for gene transfection into neuronal cells 显示文摘 | WANGEREK L A DAHL H H SENDEN T J | 2001 | J Gene Med2001，3，： | 1 |
| 5 | Supramolocular structure and nuclear targeting efficiency determine the enhancement of trans- fection by modified polylysine显示文摘 | Chan CK Senden T Jans DA | 2000 | Gene therapy2000，7，19： | 1 |
| 6 | 查看详情显示文摘 | Senden M M G Punt A D Hoek A | | 0，，： | 1 |
| 7 | Direct measurement of colloidal forces using an atomic force microscope显示文摘 | DUCKER W A SENDEN T J PASHLEY R M | 1991 | Nature1991，353，6341： | 1 |
| 8 | Clinimetric quality of the new2011 Knee Society score:high validity,low completion rate 显示文摘 | Dinjens RN Senden R Heyligers IC | 2014 | Knee2014，21，3： | 1 |
| 9 | Measurement of forces in liquids using a force microscope显示文摘 | DUCKER W A SENDEN T J PASHLEY R M | 1992 | Langmuir1992，8，7： | 1 |
| 10 | Maternal and perinataloutcome of preeclampsia with an onset before 24 weeks' gestation Audit in a tertiary referral center显示文摘 | Gaugler Senden IP HuijssoonAG VisserW | 2006 | Eur J Obstet Gynecol Reprod Biol2006，128，20： | 1 |
| 11 | What is a normal red-blood cell mass for professional cyclists? 显示文摘 | Senden JMG Brouns F | 1998 | Lancet1998，352，： | 1 |
| 12 | Detoxification and energy recovery by wet air oxidation of waste strenms显示文摘 | Akse H N Senden M M G Tels M | | 0，，： | 1 |
| 13 | Adsorption of the poly (oxyethylene) nonionic surfactant C,2E5 to silica: a study using atomic force microscopy 显示文摘 | Rutland M W Senden T J | 1993 | Langmuir1993，9，2： | 1 |
| 14 | Direct measurement of colloidal forces using an atomic force microscope 显示文摘 | Ducker W A Senden T J Pashley R M | 1991 | Nature1991，353，： | 1 |
| 15 | Meternal and perinatal outcome of preeclampsia with an onset before 24 weeks gestation: Audit in a tertiary referral center 显示文摘 | Gaugler Senden IP Huijssoon AG Visser W | 2006 | Eur J Obstet Gynecol Reprod biol2006，128，12： | 1 |
| 16 | Measurement of forces in liquids using a force microscope 显示文摘 | Ducker W A Senden T J Pashley R M | 1992 | Langmuir1992，8，7： | 1 |
| 17 | Patella retention versus replacement in total knee arthroplasty:functional and clinimetric aspects显示文摘 | van Hemert WL Senden R Grimm B | | 0，，： | 1 |
| 18 | Maternal andperinatal outcome of P center 显示文摘 | Gaugler Senden IP Huijssoon AG VisserW | 2006 | Eur J Obstet Gyne col Reparod Biol2006，128，12： | 1 |
| 19 | Direct measurement of colloidal forces using an atomic force microscope 显示文摘 | DUCKER W A SENDEN T J PARSHLEY R M | 1991 | Nature1991，353，6341： | 1 |
| 20 | Direct measurement of colloidal forces using an atomicforce microscope显示文摘 | Ducker W A Senden T J Pashley R M | | 0，，6341： | 1 |
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