{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:VALI2D7IMMZNUKRZWVOONZ6QZY","short_pith_number":"pith:VALI2D7I","canonical_record":{"source":{"id":"1608.03529","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-08-09T21:10:50Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"01809e7997d0dd6ad52771a4836dc410a6447a643a0cc962b9a22fdaca269e48","abstract_canon_sha256":"10737adb355ab08ee9cf50003b899e24802e5ce6ad4b3af9e6f8d4029969dbac"},"schema_version":"1.0"},"canonical_sha256":"a8168d0fe86332da2a39b55ce6e7d0ce24ae65804b2d07a18eec71a4533e6dcb","source":{"kind":"arxiv","id":"1608.03529","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.03529","created_at":"2026-05-18T00:57:39Z"},{"alias_kind":"arxiv_version","alias_value":"1608.03529v1","created_at":"2026-05-18T00:57:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.03529","created_at":"2026-05-18T00:57:39Z"},{"alias_kind":"pith_short_12","alias_value":"VALI2D7IMMZN","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"VALI2D7IMMZNUKRZ","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"VALI2D7I","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:VALI2D7IMMZNUKRZWVOONZ6QZY","target":"record","payload":{"canonical_record":{"source":{"id":"1608.03529","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-08-09T21:10:50Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"01809e7997d0dd6ad52771a4836dc410a6447a643a0cc962b9a22fdaca269e48","abstract_canon_sha256":"10737adb355ab08ee9cf50003b899e24802e5ce6ad4b3af9e6f8d4029969dbac"},"schema_version":"1.0"},"canonical_sha256":"a8168d0fe86332da2a39b55ce6e7d0ce24ae65804b2d07a18eec71a4533e6dcb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:57:39.363555Z","signature_b64":"dMSEAATBHHa4BMGuJIFceP0QjJ1k6xcnuzXwA8WaCYqXAYpRubAn4kDBU7VFMnOcxmeDNNoxGLX47TzZ+K3MAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a8168d0fe86332da2a39b55ce6e7d0ce24ae65804b2d07a18eec71a4533e6dcb","last_reissued_at":"2026-05-18T00:57:39.362962Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:57:39.362962Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.03529","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:57:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"jS3Ne5rwCvVtZNw1YvgBxIuiDq0AA/TxPhRDevVVR1yE2WR/Px5GIcvf0BfluNN4LzIahAkCXSYVA5eLysTTBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T05:25:13.770359Z"},"content_sha256":"ee69c119a49bce9dbb0573b2330ab775622540d6008659b0bed26bdcbf411ddd","schema_version":"1.0","event_id":"sha256:ee69c119a49bce9dbb0573b2330ab775622540d6008659b0bed26bdcbf411ddd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:VALI2D7IMMZNUKRZWVOONZ6QZY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Dynamical co-existence of excitons and free carriers in perovskite probed by density-resolved fluorescent spectroscopic method","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Kai Wang, Lixin Xiao, Qihuang Gong, Shufeng Wang, Wei Wang, Xiangyuan Wang, Yanping Lv, Yantao Shi, Yu Li, Zhijian Chen","submitted_at":"2016-08-09T21:10:50Z","abstract_excerpt":"Using transient fluorescent spectra at time-zero, we develop a density-resolved fluorescent spectroscopic method for investigating photoproducts in CH3NH3PbI3 perovskite and related photophysics. The density dependent dynamical co-existence of excitons and free carriers over a wide density range is experimentally observed for the first time. The exciton binding energy (EB) and the effective mass of electron-hole pair can be estimated based on such co-existence. No ionic polarization is found contributing to photophysical behavior. It also solves the conflict between the large experimentally me"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.03529","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:57:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"f691/rz1dqJryzSFs8NVOxYZd2zvWZq3NAHPn1YyqUT3qVB7/lJD8bCdHyoJKkKrf9moucrtCQK0uhknzTQMAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T05:25:13.770709Z"},"content_sha256":"dca51e3945dd8012a0a3c3197551beef6bebdfedf054141b375d4566fe8507d1","schema_version":"1.0","event_id":"sha256:dca51e3945dd8012a0a3c3197551beef6bebdfedf054141b375d4566fe8507d1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VALI2D7IMMZNUKRZWVOONZ6QZY/bundle.json","state_url":"https://pith.science/pith/VALI2D7IMMZNUKRZWVOONZ6QZY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VALI2D7IMMZNUKRZWVOONZ6QZY/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-02T05:25:13Z","links":{"resolver":"https://pith.science/pith/VALI2D7IMMZNUKRZWVOONZ6QZY","bundle":"https://pith.science/pith/VALI2D7IMMZNUKRZWVOONZ6QZY/bundle.json","state":"https://pith.science/pith/VALI2D7IMMZNUKRZWVOONZ6QZY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VALI2D7IMMZNUKRZWVOONZ6QZY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:VALI2D7IMMZNUKRZWVOONZ6QZY","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"10737adb355ab08ee9cf50003b899e24802e5ce6ad4b3af9e6f8d4029969dbac","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-08-09T21:10:50Z","title_canon_sha256":"01809e7997d0dd6ad52771a4836dc410a6447a643a0cc962b9a22fdaca269e48"},"schema_version":"1.0","source":{"id":"1608.03529","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.03529","created_at":"2026-05-18T00:57:39Z"},{"alias_kind":"arxiv_version","alias_value":"1608.03529v1","created_at":"2026-05-18T00:57:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.03529","created_at":"2026-05-18T00:57:39Z"},{"alias_kind":"pith_short_12","alias_value":"VALI2D7IMMZN","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"VALI2D7IMMZNUKRZ","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"VALI2D7I","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:dca51e3945dd8012a0a3c3197551beef6bebdfedf054141b375d4566fe8507d1","target":"graph","created_at":"2026-05-18T00:57:39Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Using transient fluorescent spectra at time-zero, we develop a density-resolved fluorescent spectroscopic method for investigating photoproducts in CH3NH3PbI3 perovskite and related photophysics. The density dependent dynamical co-existence of excitons and free carriers over a wide density range is experimentally observed for the first time. The exciton binding energy (EB) and the effective mass of electron-hole pair can be estimated based on such co-existence. No ionic polarization is found contributing to photophysical behavior. It also solves the conflict between the large experimentally me","authors_text":"Kai Wang, Lixin Xiao, Qihuang Gong, Shufeng Wang, Wei Wang, Xiangyuan Wang, Yanping Lv, Yantao Shi, Yu Li, Zhijian Chen","cross_cats":["physics.chem-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-08-09T21:10:50Z","title":"Dynamical co-existence of excitons and free carriers in perovskite probed by density-resolved fluorescent spectroscopic method"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.03529","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:ee69c119a49bce9dbb0573b2330ab775622540d6008659b0bed26bdcbf411ddd","target":"record","created_at":"2026-05-18T00:57:39Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"10737adb355ab08ee9cf50003b899e24802e5ce6ad4b3af9e6f8d4029969dbac","cross_cats_sorted":["physics.chem-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2016-08-09T21:10:50Z","title_canon_sha256":"01809e7997d0dd6ad52771a4836dc410a6447a643a0cc962b9a22fdaca269e48"},"schema_version":"1.0","source":{"id":"1608.03529","kind":"arxiv","version":1}},"canonical_sha256":"a8168d0fe86332da2a39b55ce6e7d0ce24ae65804b2d07a18eec71a4533e6dcb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a8168d0fe86332da2a39b55ce6e7d0ce24ae65804b2d07a18eec71a4533e6dcb","first_computed_at":"2026-05-18T00:57:39.362962Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:57:39.362962Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dMSEAATBHHa4BMGuJIFceP0QjJ1k6xcnuzXwA8WaCYqXAYpRubAn4kDBU7VFMnOcxmeDNNoxGLX47TzZ+K3MAw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:57:39.363555Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.03529","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ee69c119a49bce9dbb0573b2330ab775622540d6008659b0bed26bdcbf411ddd","sha256:dca51e3945dd8012a0a3c3197551beef6bebdfedf054141b375d4566fe8507d1"],"state_sha256":"ea9d3b2a0414f2c908dc4dd4d878861ff4b2ba53725dd3fd37a03dab8c8fb2bf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tb1yXEFJdR9eqzdJ0p+qjT2DAHeEL8lNKNeeOVX+3hgNkBAGZDut9lMVVP5s1bx3RhKkygChI8XQnUF18AScCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T05:25:13.772579Z","bundle_sha256":"e2282445991d99f5f078e687774e79c67a911918ccb7d325e57af25fd5d5551a"}}