diff --git a/tests/test_gateway.py b/tests/test_gateway.py
index fee532b..f4031d1 100644
--- a/tests/test_gateway.py
+++ b/tests/test_gateway.py
@@ -532,7 +532,7 @@ def test_gateway_raw_device_initialized(
         "raw_device_initialized",
         RawDeviceInitializedEvent(
             device_info=RawDeviceInitializedDeviceInfo(
-                ieee="00:0d:6f:00:0a:90:69:e7",
+                ieee=zigpy.types.EUI64.convert("00:0d:6f:00:0a:90:69:e7"),
                 nwk=0xB79C,
                 pairing_status="INTERVIEW_COMPLETE",
                 model="FakeModel",
diff --git a/zha/application/const.py b/zha/application/const.py
index 1b79f15..61dce32 100644
--- a/zha/application/const.py
+++ b/zha/application/const.py
@@ -319,6 +319,7 @@ def description(self) -> str:
 ZHA_GW_MSG_DEVICE_FULL_INIT = "device_fully_initialized"
 ZHA_GW_MSG_DEVICE_INFO = "device_info"
 ZHA_GW_MSG_DEVICE_JOINED = "device_joined"
+ZHA_GW_MSG_DEVICE_LEFT = "device_left"
 ZHA_GW_MSG_DEVICE_REMOVED = "device_removed"
 ZHA_GW_MSG_GROUP_ADDED = "group_added"
 ZHA_GW_MSG_GROUP_INFO = "group_info"
diff --git a/zha/application/gateway.py b/zha/application/gateway.py
index b6456c9..9a049fb 100644
--- a/zha/application/gateway.py
+++ b/zha/application/gateway.py
@@ -34,6 +34,7 @@
     ZHA_GW_MSG,
     ZHA_GW_MSG_DEVICE_FULL_INIT,
     ZHA_GW_MSG_DEVICE_JOINED,
+    ZHA_GW_MSG_DEVICE_LEFT,
     ZHA_GW_MSG_DEVICE_REMOVED,
     ZHA_GW_MSG_GROUP_ADDED,
     ZHA_GW_MSG_GROUP_MEMBER_ADDED,
@@ -98,6 +99,16 @@ class DeviceJoinedEvent:
     event: Final[str] = ZHA_GW_MSG_DEVICE_JOINED
 
 
+@dataclass(kw_only=True, frozen=True)
+class DeviceLeftEvent:
+    """Event to signal that a device has joined the network."""
+
+    ieee: EUI64
+    nwk: int
+    event_type: Final[str] = ZHA_GW_MSG
+    event: Final[str] = ZHA_GW_MSG_DEVICE_LEFT
+
+
 @dataclass(kw_only=True, frozen=True)
 class RawDeviceInitializedDeviceInfo(DeviceJoinedDeviceInfo):
     """Information about a device that has been initialized without quirks loaded."""
@@ -371,7 +382,7 @@ def device_joined(self, device: zigpy.device.Device) -> None:
             ZHA_GW_MSG_DEVICE_JOINED,
             DeviceJoinedEvent(
                 device_info=DeviceJoinedDeviceInfo(
-                    ieee=str(device.ieee),
+                    ieee=device.ieee,
                     nwk=device.nwk,
                     pairing_status=DevicePairingStatus.PAIRED.name,
                 )
@@ -385,7 +396,7 @@ def raw_device_initialized(self, device: zigpy.device.Device) -> None:  # pylint
             ZHA_GW_MSG_RAW_INIT,
             RawDeviceInitializedEvent(
                 device_info=RawDeviceInitializedDeviceInfo(
-                    ieee=str(device.ieee),
+                    ieee=device.ieee,
                     nwk=device.nwk,
                     pairing_status=DevicePairingStatus.INTERVIEW_COMPLETE.name,
                     model=device.model if device.model else UNKNOWN_MODEL,
@@ -418,6 +429,9 @@ def device_left(self, device: zigpy.device.Device) -> None:
         if zha_device is not None:
             zha_device.on_network = False
         self.async_update_device(device, available=False)
+        self.emit(
+            ZHA_GW_MSG_DEVICE_LEFT, DeviceLeftEvent(ieee=device.ieee, nwk=device.nwk)
+        )
 
     def group_member_removed(
         self, zigpy_group: zigpy.group.Group, endpoint: zigpy.endpoint.Endpoint