2004
DOI: 10.7498/aps.53.367
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Curvature vacuum correlations in quantum gravity

Abstract: Under the flat Minkowski space-time background,in the harmonic and the arbitrary coordinate systems,we obtained the graviton free propagators in the n-dimensional general relativity (GR) and the high derivative gravity respectively,calculated the expressions of the leading terms of several two-point curvature vacuum correlation functions,and proved that they are zero in the GR,but in the high derivative gravity they are not zero.

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Cited by 3 publications
(4 citation statements)
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“…[20][21][22] Compared with evaporation, solution-processing methods have been intensively demonstrated as more economical approaches for the mass production of large-area OLED displays. [23][24][25] However, the efficiency of reported solutionprocessed MR-TADF OLEDs remains far inferior to that of their vacuum-deposited counterparts, [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] among which pure blue devices with y color coordinate below 0.20 show extremely low efficiency with EQE of only 16.6 %. [29] The hyperfluorescence is formed by adding a conventional TADF material with high reverse intersystem crossing (RISC) rate in the emissive layer as the sensitizer, which could obviously improve the efficiency of MR-TADF devices by accelerating the triplet exciton upconversion for avoiding exciton annihilation events of long-lived triplets, [29,33,44,45] such as triplet-triplet and triplet-polaron interactions.…”
Section: Introductionmentioning
confidence: 99%
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“…[20][21][22] Compared with evaporation, solution-processing methods have been intensively demonstrated as more economical approaches for the mass production of large-area OLED displays. [23][24][25] However, the efficiency of reported solutionprocessed MR-TADF OLEDs remains far inferior to that of their vacuum-deposited counterparts, [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] among which pure blue devices with y color coordinate below 0.20 show extremely low efficiency with EQE of only 16.6 %. [29] The hyperfluorescence is formed by adding a conventional TADF material with high reverse intersystem crossing (RISC) rate in the emissive layer as the sensitizer, which could obviously improve the efficiency of MR-TADF devices by accelerating the triplet exciton upconversion for avoiding exciton annihilation events of long-lived triplets, [29,33,44,45] such as triplet-triplet and triplet-polaron interactions.…”
Section: Introductionmentioning
confidence: 99%
“…in 2016, [3] efficient vacuum‐deposited narrowband red, green and blue OLEDs covering the full color have been developed, [4–19] revealing extremely high external quantum efficiency (EQE) of 36.1 %, 40.1 % and 43.9 %, respectively [20–22] . Compared with evaporation, solution‐processing methods have been intensively demonstrated as more economical approaches for the mass production of large‐area OLED displays [23–25] . However, the efficiency of reported solution‐processed MR‐TADF OLEDs remains far inferior to that of their vacuum‐deposited counterparts, [26–43] among which pure blue devices with y color coordinate below 0.20 show extremely low efficiency with EQE of only 16.6 % [29] …”
Section: Introductionmentioning
confidence: 99%
“…[20][21][22] Compared with evaporation, solution-processing methods have been intensively demonstrated as more economical approaches for the mass production of large-area OLED displays. [23][24][25] However, the efficiency of reported solutionprocessed MR-TADF OLEDs remains far inferior to that of their vacuum-deposited counterparts, [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] among which pure blue devices with y color coordinate below 0.20 show extremely low efficiency with EQE of only 16.6 %. [29] The hyperfluorescence is formed by adding a conventional TADF material with high reverse intersystem crossing (RISC) rate in the emissive layer as the sensitizer, which could obviously improve the efficiency of MR-TADF devices by accelerating the triplet exciton upconversion for avoiding exciton annihilation events of long-lived triplets, [29,33,44,45] such as triplet-triplet and triplet-polaron interactions.…”
Section: Introductionmentioning
confidence: 99%
“…in 2016, [3] efficient vacuum‐deposited narrowband red, green and blue OLEDs covering the full color have been developed, [4–19] revealing extremely high external quantum efficiency (EQE) of 36.1 %, 40.1 % and 43.9 %, respectively [20–22] . Compared with evaporation, solution‐processing methods have been intensively demonstrated as more economical approaches for the mass production of large‐area OLED displays [23–25] . However, the efficiency of reported solution‐processed MR‐TADF OLEDs remains far inferior to that of their vacuum‐deposited counterparts, [26–43] among which pure blue devices with y color coordinate below 0.20 show extremely low efficiency with EQE of only 16.6 % [29] …”
Section: Introductionmentioning
confidence: 99%